Changes:
Compatibility-breaking protocol change
Let miners voluntarily raise their share difficulty so
P2Pool's required difficulty can drop, which will lower variance for
small miners
Include SHA256 midstate in shares so that PoW can be verified
in isolation, which enables future stronger DoS-proofing
No longer allow payouts to go to any script. All payouts will
go to pubkey hashes (as with normal transactions), which also reduces
the size of shares slightly
Fix for fork issue on Litecoin network only caused by recent
period of fast blocks
Persistent note: I would recommend switching to Bitcoin 0.6.0 RC 1,
which includes the RPC getblock call. The getblock call lets P2Pool
keep track of block heights more robustly, and so might protect you
from sharechain forks. Download it from
https://bitcointalk.org/index.php?topic=63165.0