Finally, here it is:
Windows wallet
Mac OS X wallet
Linux wallet

Hardfork is set to block 43000.
The general idea is that there is some additional information in each block that proofs that miner knows whole block and private key for spending coinbase transaction. That means that if you mine in a pool you can submit shares as usual and get reward for them but if you will actually find a valid block then you can send it directly to the network instead of the pool and get full reward for it. Pool may detect it and ban you but this is still may be advantageous for you. If your mining power gives you low probability of finding a block then if you will accidentally find a block it gives you more profit even if the pool will ban you for not sharing this block. If you have enough mining power to find blocks consistently then you can connect to a pool and submit shares for some time but steal the first found block, this way you can get both reward for your shares and actual block that you mined, this is like doubling your hashrate.
Given all this I don't expect that anyone will create a pool. But if someone will then I will modify whatever miner software will be used for it to implement the stealing described above, we may expect that most pool miners will then switch to this cheating version which will make this pool useless.

Also I made built-in GUI for the miner. Currently it is still the same CPU miner but in the future I want to make as interface to external miners. Other developers (and me) will be able to independently create CPU and GPU miners and fastest such miners will be distributed with the wallet and available from GUI.

I changed difficulty retarget to six hours. I don't want to set it to lower values because then it may become vulnerable to manipulation by setting improper block timestamps.

Existing GPU miner will become unusable after the fork point because of the modifications to the mining algorithm which are necessary to prevent pools.

AFAIK, it makes no difference to send the new block to the pool or send it directly to the network, since it doesn't matter who posts it, but ratter who is able to retrieve it.

Since the miner must have the PK to mine, it can always spend the money from the pool, even the blocks he did not mine by himself.

And if I get that right, to be accepted the block must not only hash to a certain difficulty, but also the generated coins must be sent to the same address that signs the block? So i can't mine directly to more than one address like p2pool does?

I updated builds, should work now:
Windows wallet
Mac OS X wallet
Linux wallet

I updated builds, should work now:
Windows wallet
Mac OS X wallet
Linux wallet

I don't know much about OS X, I have never used it. I'm just using the same build process from Darkcoin. Do you have the same issue with Darkcoin? Maybe something is wrong with file permissions, i.e. there is no executable permission, although in that case you would not be able to run it from command line either.

Do you have the very latest build?
There was an error in the new build provided before fork.

Correct one reads: v0.9.14.0-g0935f02-beta

Regards,
Andy