If you were entering into photography then the 50D would be an amazing choice to start with. I recently went from a 30D to a 5D. And to be honest, if I only had the 30D then the 50 would be tempting. Not a jump-out-of-my-wallet tempting, but tempting.
Since I now primarily shoot with the 5D, it doesn't do much for me. I can see how it would be amazing for some shooters, but it doesn't fit where I am.
I really hope that we see a 5D, or new FF, replacement at photokina. Canon is really due. Now that the 50D is at 15/16MP, they will have to shoot higher than that with a FF camera. That will seriously encroach upon their 1D market, but then they may release a smokin' 1DMIIIn and a 1DsMIIIn in the near future as well.