Recently we had a thread "If you owned this site" it prompted some good suggestions about site features, I've locked the thread for now as I think its run its course, also some of the suggestions were for features that we either already have in place elsewhere or are currently building and with the work were doing at the moment it would be better to look for these ideas further down the line.
An issue that we have had for some time is that every site that we run is developed independently, they all started off with a similar code base but have ended up being modified to death to cope with the different requirements of each territory, for example when we built S4i we weren't able to use Post Codes, so, much of the code had to be re-written, this makes integration with other new features harder to integrate.
So a while back we started work on a new framework to replace the code on every site, most of the office has been working on it for months and it will be many months before it will be completed, tested here, tested elsewhere and then rolled out one site at a time.
When we have it in place here you should see a number of new features, after that we can start putting together a new wish list.