Heh. I have to admit, I used them principally as a card-searching utility.
Not for what cards do, mind you...I have SOME kind of copy of almost every Magic card there is. But for a comprehensive list of cards drawn by Phil Foglio (my fave artist), for example.
It'll be a pity if they close down...they were bloody useful.
NOOOOOOOOOOOOO! I visit that site basically every day.. I'm a lowly scrub that doesn't have every card memorized, so I use it a lot to find out what things do.. I'll miss it *sniff*
I just used it to get answers for Isty's trivia contests....
ErinPuff: If it's just card text you're after, www.crystalkeep.com is a good source. It has all the errata and current wordings for all the cards, sorted alphabetically, set, or color.
If you wanted to find all of red's creatures that were 1/1's though, you're out of luck... I'd say use Apprentice