Once you zoom in, the query string changes so that it includes the lat and long.
http://www.mapblast.com/myblast/map.mb?CMD=LFILL&CT=45.3974961%3A-122.727504%3A20000&GAD1=... No need to show it all and expand the node. Anyways, here is some code for conversion, go ahead and optimize away:

#!/usr/local/bin/perl -w
use strict;

sub convert {
    $_ = shift;
    my $a;
    my $b;
    /^([0-9-]+)\.([0-9]+)$/;
    ($a,$_) = ($1,("0." . $2)*60);
    /^([0-9-]+)\.([0-9]+)$/;
    ($b,$_) = ($1, ("0." . $2)*60);
    s/\..*$//;
    return "$a.$b.$_";
}
while(<stdin>){
    my $lat;
    my $lon;
    if(/.*&CT=([0-9.-]+)%3A([0-9.-]+).*/){
        my $lat = $1;
        my $lon = $2;
        print "\n\n<!-- location:latitude=" . convert($lat) . ",longit
+ude=" . convert($lon) . " -->\n";
    }
}
[download]

Perhaps, this could be included on the site, somehow.

Edited, added last idea.
==
Kwyjibo. A big, dumb, balding North American ape. With no chin.