Pete's released an update.zip that will flash the proper files and changes to build.prop to enable JIT. You should see about a 12-16% increase in linpack scores. Overall system performance should be boosted too. Whether it's noticeable or not depends on the user, I guess. I've tested this on his BB 0.7. This will probably work for other ROMs too, but it flashes the BB 0.7 build.prop, so your build number will change if you're using a different ROM. Here's the link: http://bit.ly/cNAjZs Be sure to make a backup before you do this so you can revert if you run into any instabilities. However, in my testing, the newer ESE53 ROMs are pretty stable with JIT. Good luck, happy JIT'ing!