The Sonoma Wireworks stand at Messe was small, but it had one of the highest Cool-Thing-Per-Square-Metre ratios to be found anywhere at the show ;-]
Gathered together by their shared use of the very handy Audio Copy & Paste protocol developed by Sonoma Wireworks, which allows Apps to share audio data between them, a number of developers were showcasing their iPad wares.
One of the most comprehensive iPad synthesizers I've come across - NLog Synth Pro - was being demonstrated by Rolf Wohrmann from Tempo-Rubato.
It offers 4 oscillators, 2 filters, 4 LFOs, 4 envelopes, a raft of FX and over 190 preset sounds. Oh, and there's going to be a version for OSX coming soon too, so you can transfer data between the two. Probably makes good tea, too.