There are some "classifications" of PAD artists by the date they began their PAD and these lists, maintained by several PADers, also often include a self-portrait by the artist. You can of course make up your own gallery and list everyone by name if you prefer. These lists can be quite a bit of work, especially keeping them properly sorted:
http://www.pbase.com/jeannius/links_to_ ... day_people (94 links)
http://www.pbase.com/brother_mark/links ... _galleries (75 links, three dups with the list above)
http://www.pbase.com/djarvik/links (60 links, various duplicates with both lists)
There is some unfortunate overlap among them. The first list is "closed." For the first hundred people, and then Jeanne got tired of trying to keep up. The third list is a mix of the first and second list. The second list is mostly those not on the first, but is not inclusive of all people who started after Feb. 1, 2004. I will add more people at their request, if they are taking a photo a day.
Another web site listing PADers from pbase and elsewhere on the web and that allows you to add yourself is:
http://www.photoaday.net/
Mark