This spammer is quite annoying. He's started to spam 577 ltc transactions now. Due to the way we calculate priority, sending 577 coins (even with just 1 confirmation) makes it high priority enough that it can be done for free. And he's able to cram about 13 of these into each block for free: http://blockexplorer.sytes.net/block/6a73e81f628fbd612c6c1359f7c7ef06dce074d1946608b51756d08ce7e95178