Our iPhone and Android apps will support these same channels by the time SXSW arrives. Also, you can click on the show info in the mobile apps and email the information to yourself or someone else easily.
Will there be calendar integration, i.e., add an artist's SXSW showtime+venue to my calendar when I discover something I like? If so, I can stop working on this myself and move on to something else :)
I think there's an opportunity out there for an iphone app that did sxsw music previews, to help browse through acts when meeting up with friends.