I WILL file mail fraud, but most of you chaps are alright.
I used to trade heavily on MTGFanatic.com, but the activity of others there has...waned, to put it nicely.
PWEs are fine by me for less than $10 trades.
If I ship you a bubble mailer, PLEASE for the love of gods, blot out my shipping information and reuse that son of  a bitch. For MANY reasons.
I love trading. Trading for me is more for getting cards I will play with, or cards that look cool (Phoil Phyrexian cards are my favorite. Followed by promos of all varieties.)