Best SEC rivalries that are no longer played annually

Title says it. What are some of your favorites? All of the recent talk about Auburn wanting to move East has gotten me to brainstorming.

As a Gator fan I'm of course going to be biased, but I mourn the loss of our series with Auburn. The Auburn-Florida rivalry was one of the SEC's great games and losing it in 2002 was a damn shame. LSU vs. Florida is always a big game and I look forward to it every year, but there's no denying that our two teams aren't exactly rivals.

I understand that LSU fans harbor a lot of resentment toward us because of what happened last season (and I can't really blame you guys for being pissed off about it), but while it was a step toward making the game more personal we're still a long ways away from being real rivals. I have a lot of respect for LSU's program and for the fans and I think that once LSU fans' ire toward our program simmers down that most Tiger fans should feel the same way about us. There are bad apples on each side and there's no shortage of dicktastic Gator fans but overall I think there's a mutual respect there at least once you get off the message boards.

Aggie, Arky, Mizzou, Cocks: feel free to discuss some of your rivalries that were lost when you joined the conference!

ETA: I wanted to clarify that I didn't necessarily mean just games between two SEC teams, just rivalry games between an SEC school and any other school that have been lost to time and circumstance.