BitMinter aims to make it easy for anyone to make bitcoins.

Your work is recorded in shifts. When we create a new block you get a share of the income proportional to how much of the work in the last 10 completed shifts is yours. This reward system is known as PPLNS with shifts. From 2013.04.20 onwards there is a 1% fee on mining income.

site link: https://bitminter.com/