[khorwitz]

A tool to help combat distractions like Twitter* and focus on one thing at a time: http://focusr.co.

*Although I'm pleased with Twitter's self-awareness here, and I'm not saying there's anything intrinsically wrong with services like these. You just aren't going to see many successful entrepreneurs wasting their time on these services (unless they're directly responsible for engaging users through it).

[ErikAugust]

http://cronster.com - Working on similar concept, though not the same.

Threads revolve around chronological events created/added/managed by the user - think running race, wedding, conference, concert, etc.