WARNING! This website is no longer actively maintained. It is an archive of 2 years work by Doug Belshaw who now blogs at dougbelshaw.com...
Tom Barrett, an English primary school teacher, has a useful workflow diagram (put together using the excellent Gliffy) mapping out how tools such as diigo and Google Notebook could be used in a pedagogically-sound, scaffolded way. A direct link to the diagram can be found here. The problem I’ve got - and I suspect many are in the same position - is that a) Firefox isn’t installed (and isn’t likely to be installed) on our school network, and b) students aren’t allowed to install toolbars for Internet Explorer… 
Popularity: 5% [?]
Can you not used Firefox Portable?
http://portableapps.com/apps/internet/firefox_portable
Thought you and your readers might be interested to know: Diigo also offers IE toolbar, as well as a bookmarklet (diigolet). By simply drag and drop, diigolet is compatible with all major browsers, and provides an easy alternative to do all the basic yet very powerful “Diigo” functions, ie. highlight, annotate, bookmark and forward without a toolbar download. So you won’t be limited with your school network offering
There will be a whole array of exciting innovations forthcoming, so stay tuned!
@Ollie: Can’t use Firefox portable (part of the free Portable Apps collection, for those wondering) as students are not allowed to run executable files. I, of course, am allowed to (well, on most machines…) but that’s not the point!
@Maggie: Great! I’ll have to try that out. As I use a Mac I tend not to use Internet Explorer at all - so was, I suppose, assuming. Thanks for enlightening us all.