BlockTrades (
http://blocktrades.us) supports buying and selling Ether with the following cryptocurrencies:
BitShares, BitCoin, Dash, Doge, Litecoin, Nubits, and Peercoin.
We also support sending to an Ethereum address without requiring a memo, so you can directly purchase cryptocurrencies from an exchanged-based account where you have Ether deposited without having to first send it to an Ethereum wallet.