Look-Ahead Caching For HTTP Proxies?

ryandlugosz asks: "Why can't I find an easy way to do look-ahead web caching/proxying for my network? I'm running the squid web proxy/cache right now and it's great, however I want to take it a step further. Why doesn't Squid look at the HTML I download, parse out the 'A HREF' and 'IMG SRC' tags and go get those documents while I'm reading the page that I just loaded? This way, when I click on any of those first-level links on the page there is a good chance that they're already sitting in the cache waiting for me? There would have to be a way to prioritize these look-aheads, ala explicit page requests are always loaded before look-ahead pages are downloaded. I've got lots of bandwidth and disk space at my disposal... why can't I do this easily in Linux? (BTW: there used to be a couple of windows apps that would do this for you, such as Peak's Net.Jet, but they appear to be gone now) I'd appreciate any recommendations other /.ers can provide."