Free Partition Manager software

Great product - does what it says in the name.
Easeus Partition Master - http://www.partition-tool.com/

Map Skydrive as a local drive

Using the utility here, you can find out the URL for your Microsoft Skydrive (25GB Free storage) and map it as a network place for much simpler file transfers.
http://skydrivesimpleviewer.codeplex.com/

Partition and File recovery utility

If Partition Doctor doesn't work try Testdisk and Photorec

http://www.majorgeeks.com/TestDisk_&_PhotoRec_d5561.html

Virtual CD Rom utility for mounting ISO files

Found this unsupported app from Microsoft to allow you to mount ISO files in a Virtual CD Drive.
http://download.microsoft.com/download/7/b/6/7b6abd84-7841-4978-96f5-bd58df02efa2/winxpvirtualcdcontrolpanel_21.exe

Windows Explorer - Right Click - New - remove entries

I got fed up with the ever increasing list of File -> New -> entries when you right click in a folder in Windows Explorer so went here to get instructions to remove them using Regedit.
http://windowsxp.mvps.org/shellnew.htm

Or you can use TweakUI

Codec pack

An excellent resource for complete list of codecs in one easy installable package - lite, medium and full versions available.
www.codecguide.com - download the k-lite codec pack.

Convert wmv to AVI

I use TMPGEnc - use File -> Output to File and chose AVI.

I sometimes have re-encode the audio for it to work on the Linktheater and I use VirtualDub for that.