Have a look at Google Librarian Newsletter. It has useful links to a variety of tips and hints as well as providing product updates, how-tos, and news relevant to the library community. In conjunction with the newsletter Google has now added a Google Librarian blog called Google Librarian Central.
One of the most useful links is to the Google posters available at Google Librarian Tools
The posters portray a variety of information relating to searching. The best part is that Google are allowing the free distribution of these posters.