Could I just ask one thing? What the hell are you talking about?
mIRC (6.03) doesn't send the angle brackets as part of the URL provided that they are at the beginning and/or end of the URL, which they would have to be if the person meant them to delimit the URL. Your example URL <http://www.amazon.com/> works perfectly when double clicked in mIRC.
If anything, mIRC is
too loose with treating them as delimiters, since < and > can be used validly as GET arguments - but mIRC would still ignore the final > in something like
http://www.mirc.com/blah?arnie=moo> despite no leading <.
