Hemisphere Games would like you to know that today they have released a Mac version of indie title Osmos.
Osmos is a PAX 10 Finalist among other impressive accolades.
A game that needs to be played rather than described, Osmos features ambient, minimalist gameplay based on growing yourself by absorbing smaller motes. You shrink as you propel yourself, however, so you'll need to plan your strategy carefully.
Pick it up from http://www.hemispheregames.com/osmos/
, Direct2Drive, or Macgamestore for $10.