The person who started Baby Names Map has commented on this site and linked to this website and I have been getting a fair bit of traffic from his blog and his website. I am grateful for his mentioning my site and it serves as a constant reminder to me that my site is very USA-centric. The main reason for this was to stay focused and get something up and running. Also, the US Social Security Administration site has over 100 years of name popularity information, which is a rich source of data (508,000 data points for 14,722 first names).
Despite the abundance of data from the SSA, I feel like I should add name popularity information from other countries into my website, since I can already see in my logs that I am getting some international visitors (UK and Canada for now). It would be fun to have some interactive maps or just be able to switch countries in order to view the rankings and historical graphs. I'll put it on my to-do list!