I've still got about 5 episodes to go in 2nd season of "What I like about You" (I'm doing a 1 episode a night slow-binge). It seems like the show is already starting to go in Gary & Tina 'ship direction over the last few episodes or so because it's pretty obvious Tina has a crush on Gary with the flirty comments & scenes in those episodes. But Gary is downplaying it so far. I didn't read what you posted in the spoiler quotes, but if it takes until season 4 for them to finally get together like you're suggesting, it look like the show is gonna drag out this 'ship.
Anyways I recently realized the chick that plays Tina (Allison Munn) was also the IR love interest on another WB/CW show, "One Tree Hill", for the brotha that was 1 of the main characters Skills (Played by Antwon Tanner)/