However, iTunes Match isn't everyone's cup of tea (and odds are, not available in their country. It isn't in mine).
Furthermore, iTunes Match limits at 25,000 songs. At 256kbps, thats roughly 175GB.
Very slick. I like it. Dropbox should promote this app.
I've found Dropbox works really well for documents and such, but if you're talking 100GB music collections, that's a lot of cash. Yes, this is a Dropbox issue, not an app issue. I think the app is really neat.
Dropbox supports delta sync (a la rsync), which means a change to music metadata translates to only a few bytes being transferred instead of the whole file. This is a killer.
On the other hand, there are lots of people out there who are already have their music library in Dropbox so they can sync it between their computers, so I don't think it's fatally expensive.
TuneBox is iOS though, so I will definitely be checking this app out since I have an iPhone!