SudoKoach makes solving Sudoku puzzles more fun. It does the tedious work of figuring which numbers are possible in each unsolved cell, so you can get right to the more enjoyable aspects of solving the puzzle. Helps you learn solving strategies, too!
Personal Timeclock: Tracks and reports your computer usage by project and category. It can help you with client billing, time management, and can provide the information needed at tax time to justify a deduction for business use of your computer.
FREE: MergeCDs takes all of the tracks from a multi-CD collection and stores them as one sequence of tracks. It does not read the CDs directly, instead you use Windows Media Player to rip the CDs to your computer's music library in .mp3 format.