Twitter. I do irony.
Seriously though. Twitter can be a time suck and yes it has gobbled up quite a few of my hours, but if you use it sensibly (ie like the 2010 me is going to use it) then it can be a valuable resource. I've made new friends via twitter, I've seen links to markets looking for stories, and found it to be a great marketing tool during the heady month of Olive Lemon. And now that you can create lists of your most favourite tweeple (a much nicer word than twits, despite the latter being appropriate for me and most others), so you don't have to run down your list of everyone you're following when you first log on for the day. Not that you should ever actually log on for an entire day. No, even I wouldn't do that.
Go on, sign up now and twitter with me during 2010. We can declare all our most wonderful sales, awards, and what colour pj's we're wearing.