For all of you running out of room already (you know who you are) here's the answer AirStash: wireless flash drive + pocket media server + SD adapter for iPhone, iPod touch & iPad I gotta get me one of these, as soon as I get my 3G of course.
I just ordered it. Supposed to ship by 4/30 so I'll let you guys know if the claims are real. The fact that I can use it with my phone, laptop and the ipad is very convenient. Now I have to wait for "Late April" for something else.
The only negative I see is that it looks like you will have to disconnect from your internet source WiFi to connect to this. I know!! Verizon (and Sprint) need to make a new version of the MiFi that has an SD card slot in it!!