37 Signals launches Backpack

37 Signals publicly launched Backpack today - an online personal info manager that's part wiki, part to-do list, part file storage. The best thing so far is being able to use email to add content to pages (each page gets a unique email address). You can even set up a to-do list with email, or add files to pages simply by attaching them to an email and sending to the specific page. There's a free version, and plans from $5-$19/month.

Lots of interesting thinking - I hope that the email-back-into-the-system feature gets implemented in Basecamp soon.