Ok, so after having bought myself a thumb drive and having messed with TiddlyWiki I have to say it's great.
I mean, other tools (like Calendars) let me add reminders and stuff but nothing is quite like a non-linear personal wiki. I mean for example, I was updating information about this weekend's get together and I mentioned the possibility of WarMachine to a few of the attendees so in the entry that I use to track this information on the wiki I felt I should put an entry for WarMachine and then also add entries for the army I'd like to put together and then who I know in my contacts list that has minis and plays, etc.
Once you tap the power of personal wiki you won't look back!