I have now reached the end of this course. Hooray! I've learnt about some new things (geocaching, twitter, LibraryThing), and revisited some things I knew about but had forgotten about (podcasts, flickr). There were some things from the course I already used quite frequently, like Facebook, RSS and YouTube. I've really enjoyed learning more about all of these technologies, and finding out what everyone else thinks about them too.
Thanks to Mel and Mark for coordinating the course! Hopefully we can start to incorporate some of these technologies into our libraries.