I currently own a 6600 with a lovely 256 MB MMC card, my N70 is due to arrive within the next week - now am I going to lose the use of my current MMC? will it fit into my N70? or am I going to have to put it on the shelf and invest in a new RS-MMC card? :mad:

A full-size MMC will not fit in an N70 at all (it is too long).

An RS-MMC will not work in an N70, if it is single-voltage; i.e., it should be a Dual-Voltage (DV) RS-MMC (MMCmobile) variant in order to work.