I think you're misunderstanding the issue. My browser will always be able to go to 127.0.0.1 (barring some strange IE settings or a virus). If I type the address into the URL bar or click a link, it will work fine. However, it isn't possible to use Javascript to complete POST requests between domains (or ports on the same domain).
That's what I thought too.Yeah, I meant to say that cross-domain javascript calls are forbidden, so you can't call 127.0.0.1 from a javascript that doesn't reside in 127.0.0.1. Come to think of it, it would be quite funny if browsers allowed malicious cross-domain javascript to change people's Facebook pages etc.
Now I'm hearing a report that it IS possible for javascript to do a cross-domain POST request to 127.0.0.1. Not other domains, but just specifically to that one. Great...If this is the case, then do not use the -server switch or bitcoind on a system where you do web browsing.
I'll get started on adding the password field.