Examples of a papers where Tarzan has been used for cophylogenetic analysis:

Y.-J. Choi, M. Thines: Host Jumps and Radiation, Not Co‐Divergence Drives Diversification of Obligate Pathogens. A Case Study in Downy Mildews and Asteraceae. PLoS ONE 10(7): e0133655, 2015.

F. Legendre, M. F. Whiting,P. Grandcolas: Phylogenetic analyses of termite posembryonic sequences illuminate caste and developmental pathway evolution.
EVOLUTION & DEVELOPMENT, 15(2):146–157, 2013.

G. Graciolli, C. J. B. de Carvalho: Do fly parasites of bats and their hosts coevolve? Speciation in Trichobius phyllostomae group (Diptera, Streblidae) and their hosts (Chiroptera, Phyllostomidae) suggests that they do not.
Revista Brasileira de Entomologia, 56(4):436-450, 2012.

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., 77:1–12, 2010.

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
New Phytologist
in press

Review of "Tangled Trees" by David A. Morrison, Newsletter 128 of the Australian Systematic Botany Society Inc., page 32, 2006.