I had a go at Tag crowd with interesting results. I'd tried wordle before, with no success. Tag galaxy is a lot of fun too. it uses words you nominate to collect images from Flickr to create a stunning collage sphere. I am a science and maths teacher and I suspect these tools will be more useful to English/Literacy teachers. Engaging for students in any case.
Regards, Britt Gow.
P.S. Thanks for your reply about converting Quicktime files - I'm on a PC :(