The 23 Things for Professional Development online course, of which I am one of the organisers, has recently started its second run. Last year I got as far as Thing 17 before grinding to a halt. This year I plan to complete the remaining things when they roll round (schedule here), and to add a few thoughts on the earlier things if I find myself so inspired.
My main focus is, however, going to be on reading and commenting on other peoples' blogs. Last year I got very tied up helping to administer the course; it was great experience and good fun, but didn't leave much time for more active engagement. This year I hope to change that. I've started by subscribing to the posts and comments on all the special collections and archives blogs, and I'm following up some of the commenters I've found there, and some of the posts from the combined cpd23 RSS feed. (I'll be writing up a post on how that feed's put together very soon, if anyone's interested in the techy side.)
If you're interested in my thoughts on Thing 3 (personal branding), I've written about it a couple of times over the last year. And do say hello in the comments if you've found this post on your cpd23 travels!