The best Oblivion tweaking guide: http://www.tweakguides.com/Oblivion_1.html
The best Oblivion glitch/trick/exploit guide: http://www.uesp.net/wiki/Oblivion:Glitches
What are your thoughts on Oblivion.ini tweaks?
Personally, I didn't see any difference in performance.
If you have a Gigabyte mobo, you can use the program EasyTune5 to up your CPU speed about 200-300 mhz. I normally up mine 400mhz actually. Some claim oblivion has glitches with overclocked CPUs, but I have yet to encounter one. This trick helps me gain a lot more performance in the game. Haven't had a single stability issue in the whole month I've been playing.
Anyone have anymore information on Oblivion tweaks and tricks?
I remember how DOOM3 had this one tweak that "really" improved it's performance. You'd extract the game files from their archives.
I've been wanting to do the same with Oblivion's game files from their archives, but have yet to find out how. I'm sure this'd prove to be very similar performance wise.