Dude....
As one of the people who were around a year ago when you broke up, I've got to say: be DAMN careful. You remember what it was like? You had your whole identity wrapped up in that thing, and when it ended it was the end of the world.
Here's my advice: be darn sure about EVERYTHING there is still going for you about the relationship, the breakup, and everything after that. If you drag even a hint of that into the meeting with her, it'll just reactivate everything you went through a year ago, and you'll have to deal with it all over again. This is not to say that you have to get over anything you're not over yet, but you just need to be clear exactly what there IS that you're not over.
And don't tell me you're over her and it's done and gone. I don't buy for a minute that it's really over for you. If it were, you wouldn't need advice about seeing her again.
Edit: note my signature! 