Chris, panicking is the last thing we need, but it would be a good idea to take precautions and stock up with these things.
If you get infected with this flu it takes 7 to 8 days before you have any symptoms and then it is too late as most of the infected die within 14 days! To be of any use you must take the antivirus within 48 hours of being infected.
I have it on good authority that the best means is by the use of Oseltamivir, more than 50 countries are laying on huge stocks of this product, so at least many are taking the threat very seriously. Oseltamivir may be in Tamiflu, I don't know, I'm not a chemist.
Hard work is being put in to find a vacine against this virus. If this flu does come around and you have no other protection, then face masks seem to be not such a bad idea to prevent infection from infected moisture in the air. At this time you can't catch bird flu through breathing in the air from an infected person, you can only get it from infected poultry. So if eating or preparing poultry extreem care and hygene should always be taken.
If taking precautions can save one life, then yes we should.