You're welcome, but it's not the end-all and be-all of it. When it comes to the archaeological evidence, the seminal paper on the subject seems to be
Hesse and Wapnish, "Can pig remains be used for ethnic diagnosis in the Ancient Near East?". Unfortunately, various pages are missing on Google books.
The gist of the paper, though, is that from the archaeological evidence, pig husbandry was frequent in the 3rd millennium BC, and then steadily declined throughout the Bronze Age and into the Iron Age. A resurgence of the pig came with the Hellenistic age. An interesting anomaly are the Philistines, who settled the southern Canaanite shores around 1200 BC and show an abundance of pigs. Throughout the 1st millennium BC, pigs are rare, but there are occasional finds with large numbers of pig bones.
Economical and ecological reasons seem to have played a large role in the impopularity of pigs: they need more water than other animals - as mentioned upthread by others - and only provide meat; whereas sheep provide wool, goats provide milk, and cattle provides milk and labour (ploughing).
None of that, though, explains a
prohibition against pigs, but only why they were not popular.
Another point that should be raised is the question how old the rule is, or rather, the (strict0 observance of the rule. It is too easy to simply cast everything Jewish back to 1000BC or even 1200BC, the mythical times of Moses. Much or most of Judaism is post-exilic or even later invention. So, while possibly a distinction from the Philistines, I'm very wary of that explanation.
All in all, I tend to the idea that the whole complex of Jewish dietary laws is a ploy to create an in/out-group distinction; see also xterra's childhood experiences, which show that strict observance of those rules strongly hinder interaction with "others".
Medical reasons for the Jewish custom of circumcision are baloney. See this
history of circumcision. Originally, Jewish circumcision only entailed removing the prepuce. The Hellenistic world, on the other hand, placed a high aesthetic value on a large prepuce. The Romans thought any form of circumcision was mutilation and thus barbaric. So this posed a conflict when Judea came into the Greco-Roman cultural sphere. Many Hellenized Jews tried to restore their foreskins. In reaction, the rabbis modified the circumcision procedure to the current one, i.e., removing the whole foreskin. All medical reasons put forward for circumcision, AFAIK, center around the foreskin covering the glans, so they don't apply to the original Jewish circumcision procedure.
And AFAIK, rabbis have never tried a post-hoc justification of circumcision, other than "Abraham was circumcised", whereas with most other Jewish laws, various post-hoc justifications have been offered.