Linux Reader from Disk Internals is a great tool that allows you to view the contents of various Linux Filesystems on your windows machine. Great for creating images of external drives with linux file systems as well. I use it to view drives I've grabbed from embedded systems.
NON-FREE
This utility for windows allows you to mount and modify linux file systems directly on your windows OS. Great for when you need to fix a change that messed up a system and don't want to run a live cd or anything like that. This isn't free but does have a trial.
This is my collection of various Cheat Sheets for different utilities and tools I use regularly as well as OS and development Cheat Sheets. These are absolutely great to keep on hand and at the ready.