I know somebody has soldered/made an adaptor and fitted a 64GB SD not microSD card in there's
This is something i have been thinking of doing for some time, but don't have the time or funding to buy a 64GB or larger SD card.

I discovered that in the DUAL battery mod with all battery's except the SCUD's there is enough space for a striped down (plastic casing off) SD card, only thing to do is to make an adaptor or be hardcore and solder it directly to the microSD in the N900.

I saw that lexar has put out a 128GB SD card, think about having a N900 with:
32GB internal capacity
128GB extra capacity
for a whooping 160GB (- system)