Good resources. Brainburst generally posts some interesting articles, and covers both casual and serious play. Several of the better Magic players are regular columnists.
anycraze is cardboard magic seller I check alot. Well updated, it'll list errata and the legality of cards in different formats. Sorting and looking at cards is pretty easy there.
... for a small utility that takes the MtGO 'export as csv' deck file and converts it into HTML, spreadsheets, or text files pre-sorted by colour and with links around all the cards so that noobs like me can find out what the hell you people are talking about when you say in offhand manner that card x pwns such and such a deck.
"People will not assume that what they read on the internet is trustworthy or that it carries any particular assurance or accuracy" - Lord Leveson "Hyperbole is a cancer" - Lakov Sanite