I managed to free up some internal space by moving Maps, Voice Search, Google Search, and YouTube to the SD Card. (Only works with those apps which re-downloadable from the market) First, you MUST have a rooted phone. Install Move2SD Enabler with External enabled and a file explorer with similar functionality to Root Explorer (ability to r/w system folders). I personally use Root Explorer. Not required, but I also use App 2 SD (the app). I find it very handy and a better overview of moveable apps than the built-in app manager. Go into the /system/app folder and delete the apk's. Also go into the /data/app folder and delete the update apk's Reboot into recovery and wipe the dalvik-cache. Reboot the phone. Go into the Market and redownload the removed apps. They should now be installed on your SD card freeing up a little bit more internal space on your phone.