I get the "Secret Identity theft" pun, obviously, but, story-wise, I'm confused:
1. What is the *point* of it? People intentionally dressing up like nerds?
2. Does this mean the have to *know* the heroes' secret identities in order to steal them?
3. Am I missing a reference? Is it public knowledge now in DCVerse that Clark Kent is Superman? (I've never followed DC comics much at all).
4. What were the guys in the phone booths doing on Tuesday?
(I mean, they're secret identity theives' not super power thieves, right?)

Ahhh.... I can answer number three. Identity Crisis has a plot that addresses that point. If one were to look at the comic book continuity for DC one would discover that a lot of superheros secret identities have been blown multiple times. I think the best example of this is when Lex Luther and his cronies switched bodies with Superman and the gang.