I'll second Jacks guide to pheasant feathers it's great. make sure to print it out. He passed away and I don't know if anyone is going to take over his site so get your printouts just in case.

Another really good one is by Terry Helleckson who authored the Fish Flies book. Here's the link to his trivia section where he has the pheasant feather use's but also some other really good ones

http://www.terryhellekson.com/Trivia.htm

Here's another one by Jason Borger that's pretty good too

http://jasonborger.com/2009/05/08/dtf-feather-guide/

Hope they help

Fatman