The empty Windows section looked so sad, I thought I'd post something here. Any other Windows users hiding out there? [I can definitely understand the appeal of Macs (some wonderful software out there that's Mac-only, for one), but I've just always used Windows (or, *cough*, DOS) machines.]

Outlook for email, calendar, and a little task management

• I've created @Action, @Reference, @Waiting, @Reading Material, @Someday/Maybe, @Open Issues (some things seem to fit neither Reference nor Waiting)
• I flag emails to remind me of the specific action that must be taken; these can also pop up as reminders.
• I've got it set up so that email from my boss gets flagged for immediate reading, has its own particular color text in the in-box and makes a sound upon arrival. (This would be total overkill when applied to every email!)

Bonsai desktop (for the bulk of my Next Actions, task, project management)

• I posted about Bonsai in the PDA folder, but its desktop component is just as useful and for the same reasons: categories, filtering, easy to create hierarchical lists/outlines, etc.
• It's not free, but might be worth the ~$35 price tag to someone looking for a powerful listmaking/outlining tool that seamlessly syncs from desktop to PDA. (I was lucky enough to receive a license to it as a Christmas gift.)

I'm just doing my best to record everything in one of these two tools -- contact information, tasks, projects, lists, etc.