I've been wondering about this before. With the -nearly unlimited, at least for this purpose- storage the N900 has, a lot more data can be stored, even further than 28 days... So why hasn't this been thought of yet ?

I hope the closed parts of Maemo won't trouble building a solution there ... Every mention of enhancing any Nokia HW specific functionality seems banned ... or at least made very hard by not releasing sources... Camera excluded, thanks to fcam