Every web developer has a bag of tricks that (s)he relies on to be productive. Things like text editors (and plugins for same), Firefox extensions, quick references, server-side debug tools, client-side testing frameworks, etc. It would be great to see a session where a “definitive” collection of these were presented in rapid-fire fashion, with a brief demo to accompany each.
I would be happy to pull something like this together by polling the community and assembling a “best of” presentation, but perhaps this would be better run as a lightning talk session where attendees could register to quickly show off their tool of choice in two minutes or less. Failing that, a panel format with representatives from the Windows, Mac, and Linux developer communities showing off competing tools might work well too.