Well, after a few weeks of being rooted, getting rid of bloatware, etc., I decided to give Virtuous 3.1 a try, and downloaded it to my SD card using ROM Manager. I backed up all data in apps that had their own backup utilities and made a Titanium backup and then a nandroid in clockworkmod. After reading a number of threads, I figured ROM Manager should be OK for installing Virtuous, so I selected "install from SD", navigated to the correct file, and checked the backup and wipe options (I already had a nandroid, but figured another backup couldn't hurt). Anyway, for about 10 minutes, all I saw was a mildly disgruntled-looking android figure and a triangle with an exclamation point, which from my reading isn't what is supposed to happen. I finally pressed the power button and it went into ClockworkMod Recovery with the following message (below the menu): ClockworkMod Recovery v188.8.131.52 Finding update package... Opening update package... Verifying update package... E:failed to seek in /cache/update.zip (Invalid argument) E:signature verification failed Installation aborted I used ClockworkMod Recovery to reboot, and everything seems normal, no data lost or anything - but what did I do wrong?