I started with BTC Triplemining. With them the last 24hrs of shares you produce count.
I tested also Coinotron. I used the GUIminer srypt and they the speed and shares need some minutes to show up on the website.
However, i didnt took long to get a "reward" as they call it.
If you dont see a speed or a reward in your account after 24hrs then your setup is wrong.

edit: with Coinotron I tested LTC mining.