My Magic career ran from around the release of Stronghold to Mirrodin and Darksteel, at which point it seemed that the game had been irrevocably ruined by Mirrodin's cheap, powerful cards.  Only recently (ironically, since Mirrodin Beseiged) have I picked it back up again. 

Trade-wise I favor larger trades ($20+) to justify the postage.  My tradelist represents my more valuable cards for trade: everything in my inventory is fair game if the price is right.

My wishlist is pretty wide-ranging, but in general the cards in standard are higher-priority for me.