I wrote up a timeline of MMOs for 2008 - what happened and when for the most interesting stories. It isn't meant to cover every little thing, but a big point of it was to recap the amount of MMOs closed last year and the big launches that failed to stick with players (except for WoW's Wrath of the Lich King, which sold like hot cakes). You'll have to click the link to go to the full article and should note that if you do decide to post on f13.net that they don't take kindly to forum idiocy.
Without doubt 2008 will be a year long remembered in MMO circles. New MMOs launched, new MMOs flopped, numerous planned and existing MMOs died. It certainly wasn't a boring year for MMOs - a big change from 2007 - and revealed to anyone who cared to look that the MMO audience today isn't following the same rules they did in the past. It isn't "build it and they will come" anymore, it's "build it and they will come for the first 30 days and then god help you if you aren't up to scratch", meaning the MMO industry right now is kind of like a version of Field of Dreams where Kevin Costner's farmer goes bankrupt and has to sell the farm because he'd cleared valuable cropping land and built an expensive baseball diamond following a whimsical voice when he should have just harvested corn. Or maybe that's stretching an analogy.
Regardless, let's look at the "highlights" of MMOs across 2008, month by month.