I recently added a new detail to the splashpages in the Affiliate Toolbox, under the Promote menu. It now checks the IP address of the person who is seeing the splashpage, and it shows them how many people from their area is already members here at Hungry For Hits.
It first checks their town, then the state, then the country and finally the contintent. If there are less than 100 people in their town, it will say how many members there are from their state. If there are less than 100 members from one state, which can be the case in a lot of smaller countries and countries with a lot of smaller states, it will show the country and so on.