Use caution with the official pool, i mined for a long time, got nothing, went to the pool to see whats up, and it says:
We are investigating issues in the backend. Your shares and hashrate are safe and we will fix things ASAP.
Findblocks disabled, new blocks will currently not show up in the frontend
Blockupdate disabled, blocks and transactions confirmations are delayed
Payouts disabled, you will not receive any coins to your offline wallet for the time being
I am not accusing anyone, I'm hoping I'll get paid eventually but... I'm not gonna mine there until I get paid for the last chunk of hash. I'll post an update when things get sorted.