Some curious games have been making the rounds this last week. I dunno how legit these titles really are, so download at your own risk!

First off, we have Smoke and Mirrors, a never before released Sega CD title starring Penn & Teller. Here's a press release blurb from 1995:
Smoke and Mirrors(TM). A one-of-a-kind action/adventure game that pits Penn &
Teller against evil Las Vegas magicians Stinkbomb and Rot and their loyal minions. Penn & Teller will interact with a wild assortment of live-action characters as they set out to prove once and for all that real magic doesn't exist!

There's a mini game where you go up against "Mofo the Psychic Gorilla"! How can this game not be awesome!

Absolute Entertainment is no longer in business and it seems that Penn Jillette has given his blessings. You can download the torrent and Penn Jillette's podcast via waxy.org.

Last we have Grid Wars, a Geometry Wars PC/Mac knockoff. It's not too bad and sorta close (or as close as your gonna get with freeware) to the Xbox 360 version. It's not perfect, but still fun to play. Both Mac and PC versions are on this site.