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Do you need of space? But you need it in the size of your pinky nail? microSD (uSD) is here to save the day. TransFlash has now completed standards certification and is now known as microSD. Compatible with the SPI interface found on any SD card, this tiny form factor was created for cell phone storage and is perfect for your next MP3 project! This is a high quality push-push type SMD socket.
Project description, more information and ordering can be found at https://www.sparkfun.com/products/127
microSD Specification: https://www.sdcard.org/downloads/pls/
Adding SD to a Router: http://www.allaboutjake.com/network/linksys/wrt54g/hack/
MMC to Serial Adapter: http://homepage.ntlworld.com/seanellis/mmcserial.htm
PIC MMC Interface Project: http://www.captain.at/electronics/pic-mmc/
Example MMC Interface Code: http://www.microchipc.com/sourcecode/#mmc