Remote what now?
I must be terribly dense, but what on Earth is this "remote debugging" about, and what is the advantage?
I'll take a guess that your desktop Opera somehow connects to the phone (wifi/Bluetooth or so...?) while it's browsing a page and gets ferried the information. Or does the data get bounced off Opera's servers, like everything you browse in Opera Mini? More explanation would be welcome.
I like the idea, but I'd sooner have an emulated phone setup on my desktop to work with (used to do this with the Sun J2ME SDK), otherwise you'll still be doing a lot of pissing about with fiddly buttons just to use the browser on the phone.
The dev tools will be very welcome anyway. Firefox has Firebug, Web Developer and many other, lesser but useful, extensions. IE even has the Developer Toolbar, though this would be much more valuable if it told you _why_ the DOM was behaving with the insanity of bat ordure... Now all we need is Safari or another WebKit-flavoured browser to float a similar offering and I will be a happy bunny.