Well, maybe "geek-gasm" is a tad strong, but this may be fun.
Hat Tip: Kryptonsite.
UPDATED 10/19/09: IGN has solved the "helmet" puizzle by revealing that Hawkman and Doctor Fate will be part of the proceedings (e.g. the two-part “Smallville” episode written by Geoff Johns to air in January 2010 featuring three JSA members). Michael Shanks of Stargate fame will be playing Hawkman; Brent Stait is Doctor Fate. Meanwhile, Matt Mitovich at Fancast.com has revealed that Britt Irvin is playing Stargirl.