Yes, it is still gaining in popularity (every month it feels more and more pronounced and it feels great), and yes we are indeed the first generation of traceurs (after Mr. Belle and the traceurs of his day. Well, before us anyway). Thus, you have to be VERY GOOD at explaining what parkour is. It'll take a few sentences and some demonstrations, but it's best explained by saying "here, watch this video" and sticking your iPod or PSP or whatever in their face and showing them just what it means to be a traceur/traceus.