MINI.P2Pool.Observer - Sweep Transaction Lookup

Anyone feel they can explain what this is better than p2pool already does? I have been mining for a month on a new address and have one "sweep transaction" I was able to look up. Mine is 0.01+ and a bunch change and its at the block height very close to where I sent 0.01 xmr to this very site to prove I was human. Can anyone provide any insight? Thanks