Heroes of Might and Magic III
Age of Wonders
Diablo II (+ Lord of Destruction)
Might and Magic VI-VII(especially VII)
TES IV: Oblivion
Race 07(+ it's expansions)
For each line there are new games, for the strategy line there is Heroes 6, didn't download the demo though as according to the system requirements it won't run on my PC. If it's better than Heroes 5 though, it can be probably a game that I'll play just as much as the 3rd Heroes after I got a new PC. (it won't be nowadays though)
Diablo III is also coming, but I'm not really sure about it, will have to see further details to decide.
And on the role playing line, I'm a total fanatic of TES now, and waiting for Skyrim, but I'm sure if there was a Might and Magic X announced, with seemingly great features, I would be just as much a Might and Magic fanatic! Both games have their advantages/disadvantages.
About the racing line, I'm most looking forward for Forza Motorsport 4, after I get an Xbox (for which I'll take Skyrim too), it seems a very good racing game, and hopefully will have good online functions too, as even if I prefer single player in an RPG, I absolutely prefer multiplayer in racing games, especially if it's in an organized club! And there is rFactor 2 coming for the PC too, I'll have to wait and see if I can run it though.
To decide which one I'll like the most from these, or which one I liked from those that I've played before, is hard!