I started today as CTO at Flat World Knowledge, a publisher of open-source college text books (a good article describing the model here). It's very exciting to join a start-up and be in the education industry. I also like its similarities to the open source software industry.
While I've been on the corporate route since 2001, I've spent most of my career at small companies. I am really looking forward to the scrappiness and nimbleness of small. While I will be crazy busy, hoping I can regain my blogging activity.