Tepiiku: A fantasy-themed dice game, written in Flex and recently released for free on Flash portals. Designed for exactly three players, it features unique mechanics, good AI, and multiple game modes.
The Dark at the End of the Tunnel: One of my browser-based games - actually the most recent to be written, but the first to be released. The alpha version was created in 48 hours for a game-making competition, and subsequently debugged and tuned. Flee from an Advancing Wall of Doom through a randomly-generated labyrinth, conserving your energy and gathering potions and bombs as you go. Extremely difficult! There are ten difficulty levels; the record for beating the game, as far as I know, is Level 4. Let me know if you do better!
Jum Noli: This is a Japanese-style number puzzle I invented, in the style of Sudoku and Kakuro. Place groups of one, two or three dots into a 4x4 grid, while obeying certain restrictions. This deceptively simple puzzle is addictive and mind-bending in equal measure.
Botanical Bedlam: This is a free pencil-and-paper game for two to six players, that you can download and print out yourself. Design a garden by placing path pieces and flower beds chosen by you and your opponents. The player with the most scenic route through their garden wins - careful planning and spatial skills are key to victory!
Cryptic Crosswords: With error-checking and hints available, these online cryptic crosswords are perfect for beginners and veterans alike. If you have no idea how cryptic crossword clues work, check out the Wikipedia article before playing.