Nope. I have started to use blockmaxsize=5000 to see what will be changed. And so far there is no big difference.
bitcoin-qt continues to increase RAM consumption even when new block is found.
I can see on Graphs that when Bitcoin-qt releases occupied RAM then latency drops to its usual values.

Is there any way to avoid high CPU load by bitcoin-qt? Also latency skyrocketing to 14s...
Tried 11.4 and it seems there is a memory leak. Now started 11.2 - will see.

Can't connect to p2pool. Can't find any peers...

Edit: now I can, but I have tried everything last night and was unable to connect to any peer. Restarted everything I could.

Put maxconnections = 20 in bitcoin.conf. Bitcoind still has 36 connections(after restart). Why?

http://www.freeimagehosting.net/newuploads/zxnmd.jpg
and then silence...

+1. A lot of such messages and then p2pool just freezes.

Edit: p2pool for litecoins freezes even if I don't start miner at all...

The same steps. But don't forget to add a copy of litecoin.conf in a data folder if it's not default one. Had big problems with that.

"Authorization required".
Something wrong with login/password.
I got such messages when I tried to do merge mining with NMC. That time I didn't put rpcuser/password in bitcoin.cong file in Namecoin folder.

Ok, I see. I expected something like that Thank you for clarification.

Sure. If your miners dont submit shares to pool - it decreases your hashrate. Just ignore it if only it doesn't drop significantly.

How to check that merge mining is actually working? No NMC or IXC for a period of time despite such messages about getting new merged mining work...

What have you done with Bitcoind?

1200MH/s require ~ 1.3 hours to get a share. 12Mh/s means 100 times less, so it requires 100 times more time to get a share. That means 130 hours or 5.4 days.

If my calculations are correct, 12Mh/s means 1 valid share each 5.5 days.

You dont need to do anything.
Your miner will work and send all shares of whatever difficulty to P2pool. Pool will accept only ones with enough difficulty (approx 1200 now). All other will be ignored and will be used only to calculate your hash rate based on submitted shares.

It depends on how quickly you wish to get paid. If you don't mind be paid once per month then you may use p2pool solo. If you would prefer to recieve smaller rewards, but more often - you can use some sub-pools that share reward.
In long run total sum will be the same.

It's not luck but rather statistic 

Don't we need to change a speed of our pool to some higher value in the name of this theme?

P2Pool is actually free. There is 0.5% fee to donate to developer, but you may disable it if you wish.

After continuously stopping mining due to DDOS attacks, I have decided to mine on this pool.
It was relatively hard to configure everything, but now I don't care about all these bot-net attacks 

I start to think that probably it's not a bad idea to have decentralized pool.