DRUMMER CAFE

This isn't really self-promotion, but I'm linked with the company in question.
Two new products I'm excited about:
http://www.toontrack.com/drumtracker.asp

I've been begging them to do something like this for several years.
I'm thrilled with the end result based on the published specs. I haven't had hands on experience yet.
It's common for mainstream pop and rock mixers to replace real bass drum and snare with a single hard hit. It makes the drums sound punchy.
I'm not a fan of that, but I do like the idea of augmenting real drums with either secondary drum samples, or just noises, like sampled room from another kit, or white noise on the snare. The options are limitless.
http://www.toontrack.com/toontrack_solo.asp
Now you can play Toontrack drum sample products live, without the need of a host sequencer (Pro Tools, Cubase, Logic etc).

That is where the second product 'Solo' comes in.
It's a stand alone sound source - offering all the Toontrack library sounds, triggered via midi. They really are much more realistic than any drum brain IMO.
You can use it to play sounds from products like BFD and Addictive too.
Drumtracker, as you rightly point out, is more of a studio tool.