If you raced at least 3 USAT-sanctioned events in 2011, you have a national ranking! To see how you did, here’s where they are posted: http://www.usatriathlon.org/rankings/past-rankings.aspx
The rankings are determined based on the overall winning time of the race, and unless you’re a math-nerd, are a little hard to figure out. If you want to try to figure it out, go here: http://www.usatriathlon.org/rankings/rankings-faq.aspx
Remember that all TriUtah triathlon events are USAT-sanctioned and count towards your national ranking. Three races is all it takes, so have fun seeing how you compare to the rest of the country!