Diff 2/2:  The second number is the difficulty you're shooting for and the first is the difficulty you hit.  Even though difficulty 2 is no where close what's needed to solve a block, you submit it to the pool to show them that you're doing work.  They pay you based on how many of these shares you submit.

AMU 0:  If you have more than one miner these will show up as different numbers to let you know which miner submitted the share.