Swordmage is the first D&D novel based in the new 4th edition system. Not only does Gabe Gregoire and myself review the novel but we also chatted with the author, Richard Baker.
You can find Richard's Blog here.
Dungeons and Dragons is here.
You can buy the book here:
And of course the Candlekeep forums, the place to be if you're looking at the Forgotten Reams (and here is the Tome Forums where we also discuss these things).
Naturally you should check out the Basics of the Game.