Lots of good ones out there and it depends on were you live as to what is the best. One of my favorites is the old Shunsun Postmaster and it still works very well here even though it is an eastern pattern.
I think fish get tired of the same pattern all the time on heavely fished streams. That is why you will not catch me using a wolly bugger to much anymore. Ron
I use the zoo cougar on trout and smallies. It has a nice funky action to it. Fish seem to nail the fly on the pause between strips.
I just tied a marabou muddler like this [url=http://www.flyshack.com/DisplayItem.aspx?ItemID=10335:f2c00]http://www.flyshack.com/DisplayItem.aspx?ItemID=10335[/url:f2c00] but with a gold bead head. I like the appearance and I think it should catch some fish.
I’m from Iowa but will be fishing these critters in northeast iowa, southeast minnesota, and southwest wisconsin!
Marko
I’m with RW. I prefer the Black Ghost. Size 10.
Land Em’,
Carp
My favorite streamer is a variation of the olive matuka. It has a dyed olive grizzly marabou tail with a few strands of olive K-flash, dark olive olive rabbit strip on top, body is dubbed with an olive spectrum mohair dubbing, 4 olive rubber legs on the side, bright red Ligas dubbin up front for the gills and a golden pheasant rump feather wound as a hackle up front. Tied on a Tiemco 300, sz. 6, with about 20 turns of .030 lead on front 1/4 of hook. Looks like a baby rainbow or a baby crayfish and the browns in the fall just absolutely smash it. I fish it on the swing with a floating line, long leader or split shot, and sometimes totally dead drift under an indicator.
Other close favorites are rainbow clouser, stanley streamer, and rubber-legged brown wooley bugger.
Around here you really can’t get much more productive than an Olive bodied Woolly Bugger with brown hackle and a mixed olive and brown marabou tail.
As far as my favorite streamer goes, that’d be the Gray Ghost. It catches trout and smallmouths equally well, and well…it’s just a beautiful fly to look at too.
I have always liked the light and dark spruce. I believe they are very realistic. Any muddler with or without coneheads are dependable too.
Black/Red Glass Bead Rattlesnake !!!
My favorite streamer is the PSS (Pine Squirrel Streamer) I was tying flies beside Biot Midge at the sowbug-roundup a couple of years ago when he showed the fly to me. It now has a proud place in all my fly boxes.
lets go fishin
Antron Midge
…fly tying is the next best thing to fishing; it is the sort of licking of the lips that eases a thirsty man in the desert
Arthur Ransome
I’ve found recently that mixing up the colors on a wooly bugger is pretty effective – different combinations of olive, black and brown for the tail, body and hackle seem to get the fish more excited than single-color versions.
DANBOB
In my area South Okanagan I tend to use either Erie Streamer or a Little Fort…of course…buggers always up your chances of a good fish… 
))
mojo
I like streamers with lots of flash so I can cover lots of water quickly. All my buddies use rooster tail spinners with spinning rods and are constantly moving. To keep up I like using smelt patterns with as much flash I can get in them.
Who has time for stress when there are fish to catch.
Nick
I’ve had good luck with some of Doug Swishers streamers, the Fluzzie, the Polar Bear, and the Red Collared Wacker. I’ve also had good luck in the upper Delaware with a white Zonker.
Bob
There is a fine line between fly fishing, and standing in the water waving a stick.
Depending on the water and matchng the hatch the following are superb. Keep in mind that minnows are as varied as are insects and if we acknowledge that trout can key into a particular caddis hatch we can certainly figure out they’ll key on a particular forage minnow.
Hornberg
Black Ghost
for a couple of favorite streamers and better yet as I am a big fan of bucktails, the
Cosseboom
The Sushan Postmaster
Black Nosed Dace
or for more of an attractor the
Royal Coachman or
Lt Spruce Fly and I prefer these tied with white goat hair as a bucktail rather than a streamer.
Good Fishing
Chuck Scheerschmidt
“I’ve traveled a long way and some of the roads weren’t paved.”
Don’t know if’n this classifies as a streamer, but it does a right fine job pestering troutoids (and most anything else) that are munching minnows.
…lee s.
The one tip I don’t think anyone said: Make sure your streamer is not larger than the trout will take! If the trout average less than three pounds don’t go with sizes larger than 10 or 12. -Migs
Like most of the other respondents, I don’t think that you can go wrong with a black or olive Wooly Bugger. Muddlers, in natural colors, are pretty safe bets also. While I love the old, classic streamers and bucktails, they don’t compare to buggers and muddlers.
You had better learn to be a happy camper. You only get one try at this campground and it’s a real short camping season.
Reuel,I believe I mentioned in one of the responses that I am fishing in the small streams of northeast Iowa, southeast Minnesota, and southwest Wisconsin and by trout that pretty much means for every species of trout.
Marko
[This message has been edited by xisintheend (edited 09 October 2005).]
[This message has been edited by xisintheend (edited 09 October 2005).]
Well heres one for yeah 
, tie a buck bug so that it is sparsely hackled. Cut the body in a pencil shape,long even length like a pencil, no rounded shape at all, this pencil bodied buck bug is a great wet fly/ streamer. You can also add some longer hackle to the palmer instead of a conventional length to give that wavy undulating motion. Looks alot like a wooly worm/bugger, but has more boyancy.
later
Mike
[This message has been edited by Newfoundlander (edited 09 October 2005).]
Grey Ghost
Ever since I first saw one I thought it would catch fish; it did and still does.
[This message has been edited by Bamboozle (edited 10 October 2005).]