The WHO continues to issue regular updates posted on the WHO main page, as well as other advisories linked from that page. Here is the current update:

Influenza A(H1N1) – update 31  17 May 2009

— As of 06:00 GMT, 17 May 2009, 39 countries have officially reported 8480 cases of influenza A(H1N1) infection.

Mexico has reported 2895 laboratory confirmed human cases of infection, including 66 deaths. The United States has reported 4714 laboratory confirmed human cases, including four deaths. Canada has reported 496 laboratory confirmed human cases, including one death. Costa Rica has reported nine laboratory confirmed human cases, including one death.

The following countries have reported laboratory  confirmed cases with no deaths – Argentina (1), Australia (1), Austria (1), Belgium (4), Brazil (8), China (5), Colombia (11), Cuba (3), Denmark (1), Ecuador (1), El Salvador (4), Finland (2), France (14), Germany (14), Guatemala (3), India (1), Ireland (1), Israel (7), Italy (9), Japan (7), Malaysia (2), Netherlands (3), New Zealand (9), Norway (2), Panama (54), Peru (1), Poland (1), Portugal (1), Republic of Korea (3), Spain (103), Sweden (3), Switzerland (1), Thailand (2), Turkey (1), and the United Kingdom (82).

WHO is not recommending travel restrictions related to the outbreak of the influenza A(H1N1) virus. Individuals who are ill should delay travel plans and returning travelers who fall ill should seek appropriate medical care. These recommendations are prudent measures which can limit the spread of many communicable diseases, including influenza.

http://www.who.int/csr/don/2009_05_17/en/index.html

Assessing the severity of an influenza pandemic is a WHO discussion of various factors influencing influenza pandemic severity:

http://www.who.int/csr/disease/swineflu/assess/disease_swineflu_assess_20090511/en/index.html