This site has now operated more-or-less unchanged for 2.5 years, and in the process it has managed to collect a huge amount of useful propagation data. I remember it being a big deal when we hit 1 million spots, then 5 million, .... By the time we hit the 3rd anniversary of the introduction of WSPR, we will have well over 50M spots, and that's at least an order of magnitude more than I ever imagined.
I'm now working through some design ideas for a next-generation implementation of the site. Part of this will almost certainly involve separating the spot database implementation from the community/social aspects of the site. They can certainly be mashed up to provide an integrated experience, but I'm pretty sure the right thing is to divorce the underlying technologies and server environment. Personally, what I want to spend my time developing is the new data store and query interfaces, and I will post more info for feedback as I refine ideas and tinker with more scalable technologies. An important part of this is getting the right APIs in place to feed other analysis, curate data, provide monitoring/notifications, etc.
I would be very interested to hear from others who are particularly interested in moving the community aspects of wsprnet forward. I initially did this site in drupal because I had some experience with it and it was easy to deploy, but it's a bit clumsy for some of what we do (e.g., there are far better discussion forums out there!). The "chat" page could be rebuilt on twitter. You all probably lots of other ideas about what sorts of tools we could have to interact better.
Anyway, please let me know if you want to be a part of design/implementation/management of the next generation of WSPRnet.