in reply to HTML 5 and Perl N00b question...
If your end users are using websocket aware clients then HTML 5 + Mojolicious is a great way to go. Monitoring style stuff could be really wonderful over websockets (and lightweight). There is a fresh example of this kind of thing here: Mojolicious hack of the day: WebSockets (you’ll need a fairly current version of Mojolicious to run it). Note, there is less expertise/doc/tutorial available down this road; e.g., though I recommend it, I’ve barely played with it.