If you do want to learn, there are these videos which are quite useful and informative, and the bottom of the linked page. Also, those PDFs are good. There's also this.
If you played years ago and stuff, there are convenient fat packs to get you started again.
(Yeah, I know, I sound like an advertiser more than anything).
In the newest Magic the Gathering expansion, M13, they've released some beastly cards, such as this:
Spoiler
That above is like bringing a nuke to a gunfight. It's just crazy insane.
I just wanted to share that particular card, but all the expansion has some awesome stuff.
So, if you know how to play/knew how to play/wish to learn how to play, I hope this was helpful, and... erm... yeah. That's about it.
