Litecoin version 0.5.0.5 has been released.
- added minimum fee of 0.1 LTC for low priority transactions to deter transaction spam
Please get latest from source or download the Windows client binary:
https://github.com/downloads/coblee/litecoin/litecoin-windows-client-0.5.0.5.zipPool operators and solo miners should get this latest code so that you don't write these spammy transactions into blocks. Users should download the latest client so they don't propagate spammy transactions and let them slow down the client.
As terrytibbs said, this won't totally fix the problem, as the spammer can still write his transactions into blocks he finds himself. But it should reduce the network congestion of propagating these spammy transactions and reduce the number of blocks that contain these transactions.