Ever since the Canon EOS 5D was announced last August, I've lusted after its full-frame goodness. After almost a year of consideration, I've decided to purchase a 5D. Canon seems to follow an 18 month cycle for releasing new SLR cameras, so I'm hitting the end tail of the 5D's life, but with a shutter lifetime of 100,000, it should last me a few years (although I estimate that my current 20D has over the course of the past 18 months taken close to 30,000 pictures). I'm looking forward to fieldtesting the 5D in the Tour de Comic Con next week, though I suspect that for the majority of the distance shots the 20D with 1.6x crop factor might fare better (and thus the telephoto will be on the 20D). While I see my camera related expenditures dropping substantially after this, I'll need to get a flash eventually for the 5D. One of the interesting things about this upgrade is that my lenses (with the exception of the 20D kit lens) are now a bit more versatile -- for instance, the 50 prime that I have will be a 50 prime on the 5D and also an 80 prime on the 20D.
UPDATE: It looks like the Comic-Con fieldtest for the 5D is not going to happen -- Amazon is being a little slow about shipping it out.
I held one at Akihabara and the longer I held it, the more I didn't want to let it go. It's addictive that way.