Paint.NET

Simple, compact and effective bitmap editor.

Picasa

It does the job, and the price is right. What more to say?

Beyond Compare

Compare your files and directories. Compare, edit, sync, transfer, report, etc. Flexible rules, fast, and versatile. User programmable plugin architecture allows custom compares for your weird file formats.

TextPad

TextPad is my stand-by text file editor. Reg.Exp search/replace, Macros, and customizable syntax highlighting, to mention a few things.

Delphi / RAD Studio 2007

This is my bread and butter tool. If you need to get the job done, you will be hard pressed to find something better. Probably the most versatile development tool in existance.