While I'm in here for some other questions I figure I'll just mention
the GTD software I use. it is simply fantastic.
http://monkeygtd.tiddlyspot.com/demo3.html
It is free, non commercial, supported by an ever growing community. It
is also simply one single html-file, meaning it works on any computer
and that you can keep it on a usb stick or whatever. It is now version
3 so it has evolved over some years. There are also some free hosts
where you can store (and use) your file, if you want it accessible via
the web wherever you are.
It is actually based on a "personal wiki system" called TiddlyWiki
(which is also free, open source etc), see;
http://www.tiddlywiki.com/
It's worth noticing that it is a bit of a threshold to understand how
a TiddlyWiki works... but once you do, then you see the incredible
flexibility and power of it. also note you must know GTD.
Best
/Mat