Okay, here are three suggestions. Don't know how feasible they are.
Shoutbox History
Currently you have to go into the archive of the shoutbox, set a time range, and scroll back through the pages to view its history. This is okay, but if someone accidentally breaks the shoutbox (e.g. posting a long line of characters) the page arrows disappear so you can't view history for that section any more. I guess either fixing this or just adding some kind of page buttons to the shoutbox itself would be nice.
SWF Files
I can see this being a big no-no already, but if you don't ask you'll never know, huh? It'd be nice if we could embed SWF files at a larger size than 300x150. I understand that perhaps people could abuse this, so maybe you could somehow limit it to members of a certain 'age' (as in based on join date)?
For instance, it'd be great if the various 360 galleries I've made could be embedded. And the gallery in Fushigisaur's >LRR MOC Index (which I still haven't finished, I will make time for it Fushi) would be better off embedded in the topic rather than opened in a new tab.
Competitions
These are such brilliant ways of bringing the community together. I'm not just talking about the LEGO Racers tournament that took place last year, in fact I think that was flawed by the requirement for recording.* I mean MOC competitions, perhaps other gaming competitions, maybe even a modding competition?
There are some old topics that were unearthed last year featuring LRR MOCs for some competition that was held a long time ago. The models produced are fantastic, and very imaginative/inspiring. So competitions not only have short-term benefit in the form of enjoyment for competitors/'spectators', but also benefit in the long term with the products left behind.
Well, there we go. My thoughts.
*Now that we can >record ghost paths, this can be revamped!