Well, I can remember when I did teching for a living and there was always bits of software you'd use and swear by. Hence the reason for this post - I'm calling it the techy toolbag - a thread that tech can post in and recommend bits of software (technical and simple - just to make what can be a difficult job go a little smoother).
The list will grow as others add to it.
CCleaner - good for clearing out temporary files - alot better than disc cleaner
AVG Anti-spy - Anti spyware of a simple nature, and finds bits that Spybot couldn.t
AVG Free - Free antivirus software - handy for picking up those peski's
Trend Housecall - Free online virus scan - handy if you've left those CD's at home.
Seatools - HDD defect locator for Seagate HDD's
MHDD - Helpful kit that can revive busted HDD's
I will add more as I go along.