During our first chat on The Beginnings of Rome: Italy From the Bronze Age to the Punic Wars (Circa 1,000 to 264 B.C.) by T.J. Cornell, when we talked about the foundation legend, I mentioned Remus: A Roman Myth by T. P. Wiseman, Cambridge University Press, 1995, and promised to look further into it.
I've started reading the book and find it very readable and interesting. Wiseman's general approach to legend within historiography is very similar to Cornell's. Coincidentally, he cites Cornell as one of his "readers."
Some pages may be read as Google Book.
Meanwhile, here are two reviews at Bryn Mawr Classical Review:
Wiseman has also written The Myths of Rome, University of Exeter Press, 2004. Bryn Mawr Classical Review 2005.09.02.
Wikimedia Commons has some Romulus and Remus images, among others three cartoons from the Comic History of Rome (click on images to enlarge):
