Going back to the SD card issue, mine is a generic 4GB Class 6 card that came packed with another device. It mounts fine in my Galaxy S2 and my PC. I have tried taking it out and reinserting it to no avail. I'm considering buying a bigger SD card so I want to make sure there's nothing wrong with my hardware.

EDIT: Just tried a Sandisk Ultra 2GB card, and it works fine! Maybe there's only limited support in the kernel or something.