IDG World Expo has opened up Expo-only registration (http://www.macworldexpo.com/prices) for the 2011 Macworld Conference & Expo. The event will be held Jan. 26-29 in San Francisco.

The expo portion of MWSF will start Jan. 27. If you register before July 26, it’s free. Macworld 2010 ended up with more than 20,000 attendees, over 250 exhibitors and more than 150 conference sessions, according to IDG World Expo, owner of Macworld 2010.