I previously mentioned the Ant Farm DVD as a source of good DIY tips for building inflatables. Turns out their videos are up on Ubu Web. Check out Dirty Dishes for inflatable building tips (just sit through the giggly camera play at the start)
Ubu is much more in keeping with their sharing attitude – I was always surprised their videos were not archived on the web.
Even more Ant Farm inflatables wisdom can be found in the Inflatocookbook zine they published on the topic.