I'm a fly-fishin geek I guess you could say. Tie my own flies, etc . Its great fun. As a hobby it has so many different dimensions to explore -- I'll never be able to get to them all. For instance, right now I'm in the process of building a split-cane bamboo fly rod. Ordered in some 12 ft sections of Tonkin cane from China and got me a Stanley 9 1/2 block plane outfitted with a Hock blade that can scrape shavings of bamboo down to .0001 inch and well I won't bore you with all the details, but its quite a hobby in and of itself just tooling up to build a split cane bamboo rod, but I am so far,enjoying it. First rod should be done sometime in 2009.
As for fly-fishing itself, its really not that difficult. If you're used to fishing with conventional tackle and you know how to tie some basic knots and don't get frustrated too easily, you can be casting well enough to catch fish with just a few minutes of instruction. There is some snobbery types that get attracted to the sport and will insist that you take 2 weeks of lessons through an Orvis authorized dealer and that your fishing rod better have cost plenty or you aren't doing it right -- don't pay any attention to those types.
I mainly pursue trout here in the lovely state of Missouri, but smallmouth and largemouth bass caught on the fly are a new passion. Ain't nothin like having a 17 inch smallmouth explode on foam popper you made yourself.
If I can be of any assistance as you get started with this great pastime, just let me know.