I've been trying Producteev as a Office TODO manager. There is alot to like about it. Features: https://www.producteev.com/features.php Really Like: easily assign tasks to others. The Natural Language task assignment is VERY quick and similar to what I thought would work for me. example: Integrate Producteev @gc Monday 9am #stat *5 parses to.... Task: Integrate Producteev (assigned to Graham Chiu)(Due Date Monday 9am)(priority: 5 star)(tag: stat). Drag and drop date changes. Rich GUI Calendar was nice. iPhone app was free and pretty good (need more testing). Still testing: receiving alerts with Jabber or Google Talk / Gmail. Demo: free ... only 1 workspace, 2 users.