HSBCdirect.com has a 5.05% rate. I have an account with them, haven't had any problems yet. They also let me have an ATM card in case I need money quickly. I don't think ING does that.
That's a good rate...I've used DWS Scudder (and it's previous incarnations) for the last six years or so. Their money market account is currently at 4.96%. No ATM card, but I have checkwriting ($500 minimum check).