Cool Things
Notepad 2
A great text editor with some syntax highlighting. I use this for almost everything, I love the regular expression search and replace.
Notepad 2
Paint.NET
A image editor that rivals Photoshop and GIMP. It use the .NET framework, and is for windows only.
Paint.NET
Inkscape
An open source editor for creating vector graphics (.svg). I love it and it works great on windows.
Inkscape