I don't bother with benchmarking software. Nor do I bother with Adobe reader or flash, I'll simply install those when I come to a site that requires it. As I do Java development, the SDK gets installed along with the JRE and Netbeans/Eclipse.
On newer systems, I've been installing Avira anti-virus and Comodo firewall; though I'm having my doubts about Comodo.
Chrome, FF (for dev purposes), Opera (backup to chrome)
iTunes
Codec packages
VLC
Notepad++
Winrar
Thunderbird
Photoshop
Xampp
Fences
FileZilla
Those tend to be the first things I install. Other things that usually follow but I wait to install until I actually need them are:
Office
VS
DVD Burning software
Audacity
EnCase
Auslogics disk defrag & duplicate file finder
Daemon tools (for mounting images)
"Only the educated are free" ~Epictetus
"Imagination is more important than knowledge..." ~Einstein