Shortly: not too much. I walking in your shoes too. Seriously the problem is only solved with OS4. OS 3.9 is a hibrid OS it has some benefits for ppc but the main work is still mk68 cpu.
For exaple show a jpeg image (with warpjpeg datatype), ppc can do the things easily, but to read the datas from hdd, and put the decoded data for the screen is still the mk68 cpu's work. So it can be much faster if the work will be only the ppc cpu's work. So i already waiting for the OS4 to port it bppc.
Warup-powerup match i think is talked to death in these pages already. Some pup application is better than warpup, but in all, there is more warup apps out there.
Anyway i use it for the following:
Decode:
-mp3
-video( mpg,avi,divx) yes still lagging, but i think its only for the ssslow ide interface)
-Lha,zip,lzx,arj,rar - warpup version (much faster than mk68)
-datatypes (warpjpeg,warppng etc)
-There is a warpup ahi version (3.x or 4.x) i try it already, its good for composing music, with digibooster, but overall not an option.
Games:
-there is doom,hexen,heretic,quake,quakeII FPS games,
- a lot (?) of other too, (strategy,action, adventure) searh for it on HOL or any amiga dealers's shop.
My favourite is software tycoon.
Emulator:
there is some playstation, etc emu which uses warpup, but unfortunatelly not for macos.
word processing:
Amigawriter is a good ppc word processor, unfortunatelly not as usable as ms word.
Some other apps:
3d raytracing, Sound converter,
demos:
There is a bunch of good ppc demos! check them on:
http://ada.untergrund.net/If you use warpup application, you can check it is really uses ppc: idlewos.