These tiny iMono Card Readers from Brando are so small you might even lose them in your pocket if they didn't have keychains attached, but they come in three different versions that accommodate your choice of T-Flash/MicroSD memory cards, M2 or miniSD cards, and all three can read SIM cards from your cellphone.

Transfer files to the PC, or slide in your SIM card from your cellphone and back up all your contacts and other information. Might come in handy right before you rock a firmware update on that balky smartphone of yours. Not a bad deal for $10.

iMONO Card Readers: T-Flash/MicroSD, M2, MiniSD [Brando]