Using Glogster in the Classroom?

I just learned about Glogster while exploring some new blogs and I am very intrigued.  I am already thinking of a lot of classroom uses, specifically with our upcoming persuasive writing unit.  I know one of the issues I struggle with in the classroom is that we don’t have the ability to print students’ creations in color.  (Can you imagine the bill?!)  Glogster looks like it will solve my problems!  I can have up to 200 students log in and create their own poster which I can then view and assess anywhere with an internet connection.

I showed the site to my students and the reaction was very positive.  In fact, they begged to use it ASAP.  So I am reaching out to the blogosphere- how have you used Glogster in the classroom?  Any tips or warnings?