Released this morning on Xbox live is Castlevania: Symphony of the Night. I had actually never played this particular game, but was a big fan of the original Castlevania game.
This installment stays classic to the original, being a 2D scroller. That said, you don't scroll through a predetermined path. It's very open ended allowing you to go almost anywhere you want to go. It also has some RPG elements such as collecting equipment and gaining experience levels.
I'd post more, but the wikipedia link above covers it as well as I could. All I can add is that it is proving to be a FUN game!
If you have an Xbox live account, check it out.