Ever since last year's launch of Mass Effect 2, the Cerberus Daily News has offered, as its name implies, a bit of news in the universe of the game. Just recently, for instance, there was a bit about the celebration of the human New Year on the Citadel, and the biotics involved (along with copious amounts of glitter). It's been steadily giving us tidbits of news for almost the last year.
That will be put to an end come the one year anniversary of the game. As January 2's posting indicates:
"OUT-OF-GAME NOTICE: The Cerberus Daily News will begin a hiatus on January 24th, finishing its run of one full year. Daily postings will cease except for three weeks in 2011: a week of posts will precede a downloadable content release, and two more weeks will lead up to the release of Mass Effect 3. The CDN team thanks fans for their attention, comments, and feedback (both in and out of character!). We are sorry to go, but we had fun -- we hope you did, too!"
While I certainly did not load the game every day just to see these, the magic of seemingly every game having its own Wiki has been useful in keeping up with the bits and bobs of the last year. For instance, right here is an archive of every one of those updates, compiled by fans more devoted than I. (Edited in to add:) There is also this site, which treats each entry as a blog post where fans would take on the personae of characters and respond in comments.
Of course, the above announcement also brings up the point that there's to be one more piece of DLC to come for the game, and considering the release of Mass Effect 3 this year, it will likely serve to act as a link between the stories, much as Lair of the Shadow Broker does. In fact, their DLC so far has been rather hit or miss, with Lair being one I absolutely recommend, Kasumi being one I would recommend if you want a master thief in your party (her mission is also pretty fun), and Overlord being worth a pass. The rest I haven't even bothered looking into, as I generally don't feel like paying extra for weapons and armor in a game where their utility never phased me much with which to begin.
The last two bits that will be given us are also likely to be very apt to fill the hype leading up to the game's launch, so I imagine it will lead up to and report on the events we've seen in the trailer at this year's VGAs.