Unified Theory Games have made their Vortex Basic Battlefield Rules available as a free PDF download.
From their announcement:
Unified Theory Games is proud to announce the Vortex Basic Battlefield Rules are available as a free PDF download from www.UnifiedTheoryGames.com.
This 28-page edition of the rules contains everything players need to jump into the game including the Rules, Sample Combatants, a Scenario, and Markers. Additional free content will be periodically added to the Symposium, UTG’s online forum.
The Vortex Core Rulebook, scheduled for print in late 2010, is a fully customizable miniature skirmish game for use with any miniature in any setting