can someone tell me how they are getting the lights to "streak " like they are in these 2 videos

http://www.sonymusic.com/artists/Switchfoot/Video/MeantToLiveVidFull_ref.mov

and the latest from nin

http://www.nin.com/current/index.html
click the blue square at the top

I've only checked out the first link. It looks to me like a post effect.
An effect that was done in the computer with an effects and/or
compositing application.