Windows Software I Recommend

In no particular order...

PSPad

A few years ago, this would have gone to UltraEdit, but this is practically just like UltraEdit, and free, so PSPad gets the nod.

Pidgin

See Adium on the Mac page. Nuff said.

Avast Anti-Virus

Free Anti-Virus. On this platform, this is sooooo necessary.