Since many of you likely won't have seen this, I'd like to draw your attention to
It seems an executive decision has been made that a stand-alone MTG site would not be viable. Board and Card games is now officially the place on StackExchange to ask your MTG questions. Which is great, since magic-the-gathering is the number one most-talked about game on the site, by some margin.
So if you've been holding off on getting stuck in because you were waiting for another site, wait no longer! Tell your friends! More Magic players in this community will lead to better questions, better answers, and more clout when asking the devs for Magic-specific features.
Happy questioning. :)