Some of my Favorites are;

Ifranview for Graphics
http://www.irfanview.com/

Access Manager for Password management
http://www.citi-software.co.uk/

Countdown for keeping track of future dates
http://www.contactplus.com/products/freestuff/count.htm

Ultimate Zip for file zipping
http://www.ultimatezip.com/

Partition Magic for disk management (not free, but well worth every penny paid)
http://www.powerquest.com/

Belarc Advisor for system information
http://www.belarc.com/free_download.html

Roxio Easy CD Creator for burning CD's (also not free)
http://www.roxio.com/en/products/index.jhtml