Back when the official Kids WB! site was still up and running, they had a number of free downloads available to fans. The best of these was a set of digital trading cards, which they would rotate on a weekly basis. These cards are a series of 5 small flash programs that have character profiles, trivia questions, and sound clips from the show. Since that site no longer exists, I've uploaded them here.
Individual Cards
-001: Zeta/Zee
-002: Ro
-003: Agent Bennet
-004: Agents West & Lee (Lee not pictured)
-005: IU7
Sets
-All five cards in one file.