Thanks to everyone for their comments and links. I will definitely check them out.

Hitman says, "I don't see a need to store anything internaly since the USB flash drive is so much more convenient."

I'm trying to figure out how one uses styles directly from USB external storage on the 910. Does it take more button presses and take longer to bring up a style from a USB device than it does internal styles? Can USB styles be used in registration memory?