I'd like to propose a feature request for a notification system that would allow a person to subscribe to a "watch list" for sims of interest. When land in a sim of interest goes on sale to the general public, everyone in the watch-for list receives an IM notification.
Right now, with the current system, if a person wants to buy land in a particular sim, he or she has to constantly watch the map for yellow boxes to appear. Since it's unlikely a person can do that 24/7, there is the chance for missed opportunity.