A short while ago, I was talking with a co-worker about personal productivity (i.e. to-do) systems.  There are so many systems out there, and each with their own spin on GTD.  He showed me one that is a spin on the TiddlyWiki system:  Tiddlyspot.Tiddlyspot is a hosted version of TiddlyWiki, with a twist.  Not only can you work on your wiki online, but you can download a version of it to work on locally when you are, say, getting ready to get on a flight.  Once you are where you have an internet connection again, you can sync you local copy up to the server, and you are back in the cloud with it.Yeah, sure you can just get TiddlyWiki and put it on a thumb drive, but this gets you local and cloud workability without having to tote a thumb drive around with you.And, do top it off, there is a pretty slick Firefox extension that complements TiddlyWiki and Tiddlyspot.  TiddlySnip gives you three key context menu options:  TiddlySnip a selection, the clipboard, or the page. The clipboard option is perhaps the most creative of the three. Say you want to create a tiddler of something from Word, you copy it from Word, go into Firefox, and TiddlySnip the clipboard. Extremely handy.