I know folks are waiting on Hive-Engine. We're working on it as fast as we can. Back end is up and running. We're working on getting the front end up, which will take a few more servers. Still a chance for march. Might be May, and if shit goes south it may be June.
Anyway, for those looking to trade steem/Hive as a pair ionomy and blocktrades work. So does Steem-Engine. (Steem has been fairly unstable since the Hive hardfork so you may have to refresh a couple of times to login to Steem-Engine).
It also looks like a decent deal on Hive to me. As the pair on Bittrex (which is still not accepting deposits/withdrawals) is 2546 Sats/Steem and 4600 Sats/Hive. Which is a ratio of about 1.8 Steem / Hive.
Ionomy which is accepting deposits and withdrawals is showing 2334 sats/steem and 4240 sats/Hive which is 1.82 Steem/Hive.
There's just shy of 20k Hive under 1.8 Steem/Hive. So, if you think that's a good chance to pick some up then there's a market for it. If you're looking to catch some lower bids the steem side could use some buyers as people are using Steem-Engine to dump hive. So, consider placing some offers to buy Hive over there.
Instructions
To deposit steem just use the deposit button on steem-engine.
To deposit Hive send Hive on the Hive blockchain to 
HIVEP aggroed.
To withdraw Hive back to hive just click withdraw.
To withdraw Steemp back to Steem just click withdraw.
There is a 1% fee on deposits or withdrawals, but that can be made up by fishing for low buys and high sells.
So far it's a good start
Seems like a good day of trading there, so please keep steem-engine in mind as you're looking to convert between steem and hive.
If you have any questions please find the team at https://discord.steem-engine.com