Who hasn't heard of it yet? A great tool for students all ages (well, K-8 maybe).
You haven't used it? Scared to start it in your class?
No reason to postpone, help is out there!
http://www.scribd.com/doc/14015153/Glogster-Instructions
Is a great resource, it will show you clearly how to use Glogster.
http://edu.glogster.com/faq/
Explains all Glogster features
Glogster Youtube videos:
http://www.schooltube.com/user/Glogster/glogster-edu-users-guide.pdf
and last but not least, a pdf with all users tricks (embedding content etc.)
http://edu.glogster.com/download
Glogster is keen in integrating with standards, they look for examples
(submit yours here: https://spreadsheets.google.com/a/chadwickschool.org/viewform?hl=en&formkey=dEhEUkp4MWRENWE2VUVDNHdoNVVCNWc6MA
and each of the exemplary Glogster is set against the NETS standards.