1) It is a misconception that eating pork puts you at risk. Influenza is not like food poisoning: swine flu is contracted the same way regular flu is: through close contact with someone who is infected and coughs/sneezes near you. It is not acquired through eating food; pork products are safe.
2) I find it highly unlikely that this is a man-made, weaponized virus; I simply see no evidence pointing that direction. There are plenty of naturally occurring viruses that mutate in such a way as to contain genetic material from more than one species: think ebola virus: communicable both from chimp to human and from human to human. The fact the "evidence" cited comes from a site designed to prove the existence of UFOs strongly suggests that this talk is speculative at BEST, and probably not very scientific.
3) contact with people who have recently been to Mexico does increase the chances of contracting the virus since it originated there, and it is more likely that someone FROM Mexico has had such contact. Ergo, you may have something here. More generally, one should avoid public places if given the choice.