Yeah this list could get long.
Winamp
Since I went SSD's I do not have to worry about defragging, but my storage drive in my media center gets its defragmentation with defraggler.
For having a FREE option Avast is also good to have.
My actual Utilities(I use the word loosely here) folder has the following. These are only stand alone non install applications.
AnvilBenchmark
AS SSD
Autoruns
bluescreenview
ChkFlsh (I do not use this, it just made it into the folder)
Core Temp
CPU-Z
CrystalDiskInfo(on of the first programs I had that could read s.m.a.r.t on USB drives.)
CrystalDiskMark
GPU-Z
HWmonitor(various version)
Intel Burn Test
Linx
MCE live TV Buffer Manager(it just makes a registry entry for you)
Nvidia Inspector. This is great for Nvidia users
OCCT
Open Hardware Monitor. Has some extra features and logging/graphs as well
Prime95
Process Explorer
Process Monitor
PVR 250 tweak (PVR 250/350 filter settings)
RealTemp
Tmonitor
WinDirStat
A batch file to rebuilt the Windows icon cache
Symlink creator(can use mklink to do the same thing)
Universal USB Installer