Embarcadero has released yet another help update for Delphi XE2. Info in the readme file at http://docwiki.embarcadero.com/RADStudio/en/Readme_-_Help_Update_6_for_Delphi_and_C%2B%2BBuilder_XE2. According to thsi page "Over 500 pages of new content have been added to the Libraries wiki. Most of the new content is for the FireMonkey Application Platform (that is, the FMX unit scope)". The list of new pages includes quite some information about FireMonkey styles, which is a very nice addition.
So also the help is getting better, little by little. Don't stop: The more information the better.