This was a huge favourite of mine this year. Not only could I create slick-looking sites containing the necessary fixed information about the course, but learners create their own pages and link their own sites to give their texts a real audience. By encouraging them to view and comment on each others' sites and pages, they were able to practically apply peer-assessment and support each other through building their texts. As our learners already have Google Apps accounts (used mainly for email), it was a pretty painless transition, with only one log-in for a multitude of services including Google Docs, discussion forums, Picassa (galleries) etc. If Google+ was integrated with Google Apps accounts, it would definitely be my choice for this year, but although there are rumblings that this may be coming, it's not yet available.