Best professional/digital camera (SLR) out there on the market today?

Canon, and Canon and only Canon. Can't compare Canon Digital SLRs with any other camera in the world. I am a canon user and I use Canon EOS10D Digital SLR with a great 17-40mm L USM lens and 100-400mm IS L USM lens.
I love my camera and infact yesterday I took my camera in Wimbledon to see tennis and take pictures, I was surprised, every single professional photographer out there had Canon with 600mm lens.

Canon EOS 1D or 1DS MKII are the best ever professional cameras. 1D is 8frames per seconds and i have seen it used my most of the journalists even the BBC.

Depends how much you want to spend and the purpose of usage, If not for very professional use, buy a decent but cheap digital slr like Canon EOS30D with a good lens specially L series lenses, they cost a lot but is the best lens available. 5 frames per second is not bad at all with large screen.

Or go for even more expensive full frame sensor which is Canon EOS5D, expensive but a bridge between a professional high end camera.