If you read some of the blogs I do, then you've already heard about this great game, but I just have to mention the truly spectacular (and free!) Torus Trooper! I used to love Tempest when I was growing up, and this game is kind of like Tempest combined with high-speed racing. The graphics have an awesome retro wire-frame look (just like a classic vector game), and there's a fantastic groovin' soundtrack as a bonus. The best part is this game runs at blinding speed even on my wimpy 600 MHz G3, so it's a development marvel, if you ask me! You can download it for Mac OS here (but if you click through to the developer's website, there are versions for other operating systems, too).
Speaking of games, I finally finished Phoenix Wright: Ace Attorney on my Nintendo DS! The fifth and final case was absolutely huge - this week I became totally obsessed and started playing it up to three hours a day, just because I wanted to get to the bottom of the mystery! I had a blast checking for blood stains with luminol spray, and dusting for fingerprints (including "blowing" the dust away on the DS screen) was really cool. What a fantastic game!