Ativiti is the startup I’ve been working on for like a year with some friends. It will finally go closed beta in like 2 weeks.
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Since I had to keep my mouth shut for a while and I’m so proud of this project, I’m coming back with a vengeance:
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Ativiti is our take on social task management… Dead-simple, friendly. you can manage your tasks as usual, plus:

• each task has tabs, with optional features like: 
  • Team tab assigns it to other people *
  • Notes tab allows detailed information
  • Files tab allows uploads *
  • Talk tab allows discussions *
• each ativiti project can be published as a Guide: it goes to a public space where other users can save as new projects
• and vice versa: you can browse ativiti Guides so you don’t have to start a project from scratch
• users can paste Guide embeds on blogs, sites. think youtube, but for lists. *
• authors can track Guide usage: how many subscribed, how long did it take to complete, which tasks took longer to finish… *

* = not functional for closed beta
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Here are some public links so you can have an idea:

• Our blog
• Our twitter
• Ativiti layout
• iPhone app layout

Ain’t my baby beautiful? (say yes!). I’m organizing my invitation list… If by any means you want to join please email me, you’re more than welcome.