Difficulty Network GH/sec
Bitcoin 908,350,862.4370 7,585,406.7724
Devcoin 372,076,524.5403 2,441,475.2152
Freicoin 1,657,835.6670 3,955.7500
Ixcoin 252,125,764.0640 2,707,179.7778
Namecoin 543,530,791.8482 6,646,689.3048
Peercoin 25,744,470.6041 199,643.2737
Being merge mined its the same as leaves being blown by the wind. No effort is made.