Seemed like every time there is a large sell wall people freak and sell.  Buy at prices that are above support...and once you get to the (big) sell wall...you sell!  I profited (albeit a minor amount) by doing this on Cryptsy today.

It's a suprise that people will put up and/or add to a huge sell wall.  If they were smart they wouldn't do that since it effectively slows (or stops) the upward progress of buying.  More people would make profits if they realized that (I think).