What's this? Former Apple spokesperson Justin Long, using a jailbroken iPhone on Jimmy Kimmel Live? He's no longer under their thumb, so can use whatever he damn well pleases—but will he use a WP7 come October? [Thanks, Tolk!]
UPDATE: Here's the video:
DISCUSSION
I hate to point out the obvious, but it's impossible to get video output from anything non-media-player apps (like the Messages app) unless you Jailbreak.
In otherwords, they couldn't have done that segment without Jailbreaking the phone — so there's no way to tell whether they jailbroke just for that purpose or not.