Clearly, the upgrade to a digital SLR is inevitable, but there's special motivation from my upcoming desert trip. My current plan (hope!) is to get a Digital Rebel XT (since I can't quite justify the extra $700-$800 for the recently announced 30D, which I probably couldn't get in time for the trip anyway). For the lenses, I think I want the EF-S 10-22mm f/3.5-4.5 USM and the EF 24-105mm f/4L IS USM. The former is almost an L grade lens, is the widest good zoom available, and a relative bargain. The latter is a recent introduction, and promises to be a superb general-purpose lens if I can get my hands on a good copy (apparently, Canon's quality control on that lens leaves something to be desired).
The punchline is that with accessories, that's about $3200 of stuff. Worth it, though, if I can scrounge up enough. That would be my biggest purchase since my car, so I get a little woozy thinking about it.
Worst case, a coworker has those lenses, and has offered to let me use them for the trip, so I might do that. I'm going to rent the EF 70-200mm f/2.8L IS USM, because as drool-worthy a lens as that is, it's just far outside of my price range for now.
*sigh* To be rich and anonymous...