Here is a listing of 30 important things (free) for windows. I use a number of them and found some new and good softwares in the list!!
A good word processing software http://www.abisource.com/ is here although I prefer Microsoft Word and am quickly switching over to some free sources like Google docs and Openoffice.
http://www.rssowl.org/ : rssowl is a RSS feed reader, I would check it although I am a fan of Google Reader for now.
http://keepass.sourceforge.net/ : key password storer for storing passwords scattered over various places.
All in all a very good post which brought to my knowledge a number of new and good applications.