The new MyEtherwallet.com is released now. Sending ETH to contracts is now easier than ever!

In fact, you can now generate a special link that has the destination address and gas limits preprogrammed.

Here is an example for the Wealth Distribution Experiment:
https://www.myetherwallet.com/?gaslimit=200000&to=0x3325439082FF8ba7371DFdAa1AF297bBfcAc21b2&value=1#send-transaction

More info on this update:
https://www.reddit.com/r/ethereum/comments/4faooz/myetherwalletcom_v20_aka_mewtwo_has_arrived/

Now that 'normal people' can play these games too, I expect things to accelerate.