Some other webpages that mention Tarzan:
Phylogeny Programs list that is maintained by Joe Felsenstein
Genamics list of phylogeny analysis software
BiologyBrowser list of sources on evolution and phylogeny
de Vienne, D. M., Giraud, T., López-Villavicencio, M, Tellier, A., Hood, M. E. and Refrégier, G.
Cospeciation vs host-shift speciation: methods for testing, evidence from natural associations and relation to coevolution
Example of a paper where Tarzan has been used:
M.-M. Lee, S. P. Stock: A multilocus approach to assessing co-evolutionary relationships between Steinernema spp. (Nematoda: Steinernematidae) and their bacterial symbionts Xenorhabdus spp. (c-Proteobacteria: Enterobacteriaceae). Syst Parasitol (2010) 77:1–12