Sublime Text 2 may be downloaded from the Sublime Text 2 page. This is the recommended version of Sublime Text to use, and is available for Windows, OS X and Linux.
The latest version of Sublime Text 1.x is Sublime Text 1.4
It's also available as a portable version, to run off a USB key.
Sublime Text may be downloaded and evaluated for free, however a license must be purchased for continued use. There is no enforced time limit for the evaluation.