http://www.tucows.com
The big site with all the Shareware and Freeware you need. It is easy to find amonge all the programs.
With search enginee it comes easier.

http://www.downloads.com
A site with much to see and much to download.

http://www.winfiles.com
The perfect site for windows users here you can find new and fun programs for windows. Easy to find.

http://www.windows.com
Microsoft´s page for windows.