I stumbled across the BBC Inernet Blog today and thought it was quite relevant, so there's the link. I've been using the BBC website for years - although fragmented it has a ton of great features such as BBC iPlayer and BBC news.
While exploring I also happened across Glow, a javascript library from the BBC which claims to deal with DOM manipulation, event handling, and some effects. Not as lightweight as jQuery at its core, but it looks as though it may give a few more UI/widget functions per byte. I look forward to sinking my teeth into it.