From the press release:

G4 just launched its premiere merch site, G4 LTD, with an awesome selection of limited edition T-Shirts, Hoodies, DVD’s, Collector Cards, and More!  All items will be available exclusively at Comic-Con 2010 on select days at the G4 booth.  Due to high demand and limited quantities, fans can go to www.g4limited.com now to use the exclusive Pre-Select option and get priority, front of line access when they pick-up and pay at Comic-Con.

Some of the items are:

Gentle Giant “Attack of the Show” Mini-Bust Set featuring your favorite AOTS Hosts (Extremely Limited)
Nerd Porn T-Shirt (Limited to 3000 Pieces)
AOTS “Wrestler” T-Shirt (Limited to 3000 Pieces)
X-Play “Space Rocks” Hoodie (Limited to 750 Pieces)
AOTS “Shark Attack” T-Shirt (Limited to 2000 Pieces)
X-Play “TV Busted” T-Shirt (Limited to 2000 Pieces)
AOTS “Monster Attack” Hoodie (Limited to 1500 Pieces)
G4 “Attack of the Shorts” Best of… DVD (Limited to 2000 Pieces)
“Planet G” Box Set of 11 G4TV Host Collector Cards (Limited to 3000 Pieces)

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3. Free Comic Book Day 2010 Gold Comic Book Lineup Announced
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5. Jock Confirmed for 2000 AD Panel at Comic-Con International 2010