iMacworld provides exhibitor information and product information, and also integrates a messaging service. It lets you browse exhibitor lists, looking at vendors by name, hall and aisle number. You can also check exhibited products by name, category and exhibitor.

The software checks the Web for new information about Macworld Expo exhibitors and events and saves the data locally, so you don't need network or cell phone access to check.

IDG World Expo vice president Paul Kent recently posted that a major upgrade will be offered this afternoon which will enable users to navigate using a show floor map. A conference guide will also be included.

iMacworld requires an iPhone or iPod touch running iPhone 2.0 software or later.

Macworld Expo takes place from January 5 - 9, 2009 at the Moscone Center in San Francisco, Calif.