Audacity - An easy to use sound recorder which is so useful in the classroom.

Easy Unzip - Zipped file unzipper

Image Resizer Powertool - A useful Windows add-on

JPG4Email - This resizes photos in bulk. Great when adding photos to your blog.

Photo Filtre - The free version. You can create some neat effects using the filters

Picasa - Photo sorter, viewer and editor. Makes collages.

Prism - Video file converter (e.g. .mov to .avi or .wmv)

Stickies - Little 'Post-it' notes for your desktop

Switch - Converts sound files in bulk e.g. wma to MP3