So basically what I am looking for is a game that will hold over my gaming needs (an hour or two a day) until something comes out that is REALLY worth playing.

I have been playing Zu online and so far that is pretty good, I'm only about level 15 and the grind is kind of heavy but it seems cool.

DO NOT RECOMMEND:
WoW
Guild Wars
Lineage 2

Something nice, fun, casual and easy to pick up/put down would be great.

P2P or F2P is fine.

So let's get them rolling! Recommend me some games people!

Warrior Epic is coming up, and is supposedly a great "Pick up game". That means that you can just play it for however long you have and stop without having to do anything longer than that (Raids, huge boss fights, etc). It's just now about to go into CB so hurry up and apply and maybe you'll get accepted :D

You could try Dream of Mirror Online. Some people consider it casual. You can switch to any job class at any time and use skills from different job classes to compliment another job class. Lots of normal quests and there is something of a story line quest that you can follow. I also only play for about an hour or two a day. The grind in the game is hard to consider though, because technically you can level several times in two hours, but because you can level so many classes, it feels like you are doing it over and over again.