I just got this update from Tangible about their Arpeggio campaign. This is brilliant, and I think it's really worth shouting about!
"We heard a lot of backers telling us they want Arpeggio to come with an SD card slot. Even though we didn't reach our stretch goal, we want this to be the best product possible. We've done more detailed calculations and determined that we can ship Arpeggio with an SD card slot. Based on the enthusiastic feedback we've received we know this is the right decision.
Easily backup your melodies, song, and sets. A future firmware update will allow you to play samples. Make Arperggio sound like anything!"
If you didn't get in on their campaign you can still pre-order here.