I also just recently discovered the joys of fishing with furled leaders, and have started making my own. I've been experimenting with a hybrid leader with a high-visibility monofilament butt section (Stren high viz gold) tapered down to a fluorocarbon tip. I have also fished furled monofilament leaders (tied with 0.004 inch monofilament thread) with a sliding indicator - it didn't seem to damage the leader at all. As some of the previous posters have said, though, using the indicator does decrease some of the benefits of the furled leader.

Great website, by the way - I've been visiting it for some time, but just joined today.

Cheers,
Dennis