I'm pretty excited that Facebook has added the ability to check in to events to its new Facebook for iPhone version 3.4. What does this mean? Now as event marketers, we can encourage the viral spread of event buzz by encouraging even-goers to check in.
The feature rolled out on April 4. Now if its the day of an event to which you've been invited and you are nearby, you will have the option to check in to that event just like you can check in to places.
(side note: the new version also added the ability to unfriend someone directly from you iPhone. Just in case you absolutely can't wait until you get home.)