Hi Bill,
just writing to an MMC card is easy, they have an SPI interface that is directly supported. There are two problems however, Frist you have to write in chunks of 512 bytes so you need a "scratch-pad" storage. Secondly it is just raw data, not formatted. This means you cannot read it directly from windows etc on a PC. Compsys have a project to store data on a MMC or SD card in FAT format, see
http://www.compsys1.com/workbench/On...ect.html#MMSD3

It uses PBP code. I tried to get a shipping cost to the UK for one of their kit's but they did not respond to my emails

Do a google search on SD MMC Pic basic you will get a lot of hits and several useful code examples.