Canon D Rebel XTI vs EOS 30D

what is the difference between the two besides the obvious difference in MP?
they're about the same price, actually the EOS 30D is slightly cheaper in the store im buying it from

sorry for all the questions btw haha

I happen to own both bodies. A few of the differences
The 30D is larger, heavier (magnisium body vs plastic)
30D 5fps XTi 3fps
30D has spot metering
30D shutter speed to 1/8000 XTi to 1/4000
30D has a faster shutter release
30D has a longer lasting battery
30D has ISO in 1/3 stops & 3200 XTi has 100-1600 in full stops
XTi has a sensor cleaner
XTi offers an inferred remote
Images are on par with each other, I prefer the 30D but the XTi is excellent

what about the 30D XTi compared to 40D is the price diffrence woth it