A few MMOs are getting in on the action as well. EverQuest II is celebrating all week long with their pub-crawl inspired Brew Day Festival which has in turn inspired a video parody. And Pirates of the Caribbean Online has turned the seas green as well as offering shamrock tattoos and green hair to players to customize their avatar.
Even Lord of the Rings Online is slipping in its own St. Paddy's Day celebration with a quest that rewards you with a giant size keg during Spring Festival. Tapping that beast gets you so drunk, your character passes out and wakes up in another part of Middle-earth! Better in-game, than in life, eh?
Finally, if Virtual Worlds are more your style, there are sure to be many player run St. Patrick Day events in Second Life. You may have missed yesterday's float parade, but you can always visit virtual Dublin any time of year.