Hog Bay Software has released WriteRoom 3.0 on the Mac App Store. It requires Mac OS X 10.6.6 or higher and costs US$9.99.

WriteRoom is a full screen writing environment. It’s designed to let you focus on writing. Version 3.0 has been revved for Mac OS X 10.7 (“Lion”). It also lets you create and share themes and track your writing progress.

For current customers who bought WriteRoom 2, the update is free if you bought it in the last year. Otherwise it’s $4.99 to upgrade.