This is also a tricky UI problem. Live updates, where web pages move around on you while you’re reading them, aren’t always desirable. When you’re collaborating with someone you know on the same document, you want to see edits immediately, but what about a web forum? Do you really need to see the newest responses, or is this a distraction? You might want a simple indicator that a reload will show a change, though.

A white paper showing how Instant solves synchronization problems might be nice.