I currently bought a Nikon D100 and love it, but if I still were using my little Olympus C-3000, C-3040, and C-4040, I'd also be quite happy. (Anyone want to buy the 4040?).
By top of the line, if you want an SLR-type digital camera, you could go Nikon D100 or D1H (the D100 is by far the better value), or Canon D60, or Fuji FinePix S2 Pro, or the Sigma SD9.
If you want what might perhaps be the best digital camera around, go with a Sinar with a digital back:
http://www.sinarbron.com/
However, a 2 megapixel camera is all you need for web work.