Now that the World Health Organization has finally acknowledged the start of the 2009 influenza pandemic throughout the globe, it is but natural to be having second thoughts about traveling at this moment. On the other hand, the WHO maintained that issuing a travel ban will only do little to stop the spread of the virus.
Nevertheless, I believe that it would be most helpful for travelers to do their own precautionary measures. If it is possible to delay traveling to a place where there is a high transmission rate o the A(H1N1) Influenza Virus, then reset the travel date. If traveling is inevitable, practice the first lines of defense against the virus. Wear a surgical mask if possible and always sanitize your hands and personal belongings.
Here's the A(H1N1) Influenza Booklet from the United Nations for your reference.