Fascinating URL isn't it?
Anyone else thinking googleusercontent.com, why the domain name?
webcache. subdomain, okay, it's obviously the cache, so why the need to access a page with the name 'search' and a query sting to say 'access the cache' too?
It's almost looks like they are planning (are already?) using it for something else too, because it would be simple and shorter to remove the page name and the q=cache from the query string since the subdomain is obviously for the web cache, so it's almost looks like they need to differentiate to me.
If there's not the need to differentiate, they could simply use:
And, why not simply googlewebcache.com?
Maybe I'm reading too much into it though...