Drumreplacement.com will take audio files and replace your kick and snare. I can see that working for a lot of bands. Not us, just because we recorded at Trax East and our drummer Lou, using his special drum-magic, always sounds freakin' great. Also, the room sound I think is critical to our sound as a band (and I don't just mean that all the hootin' and hollerin' I do). So replacing the kick and the snare would be counterproductive to us anyway.
If you're wondering why we haven't gone and mixed this record which we recorded 10 months ago -- it's 'cause I have no cash right now. I have two movies in the can, so hopefully some money will be coming in soon.