So Ewan, Matt and Carlo (and thousands of others) have the joys of SXSW awaiting them, I can't think of a similar cross-discipline event in the UK, perhaps the Edinburgh Festival comes closest. But that misses out on the techie angle, perhaps that's a situation for Ewan to fix!
One of the best parts of SXSW for me every year (as a bystander across the Atlantic) is the collection of mp3 tracks that showcase the music of the bands appearing at SXSW, Erik Smartt points you at the first tranche of tracks - 793 MP3 files. I wonder how many of these bands are going to appear on TPN Rock?