Life for applicants using the needlessly complex International Design system is about to get a little easier, with the abolition of the 1934 London Act of the Hague Agreement. Even without the London Act, on filing an International Design it will continue to be important to check which potential designated States share the same version of the Agreement as the country of the filer. For example, British applicants can only designate Geneva Act states, except in circumstances too complex for this posting (and, of course, those with no connection to a Hague country cannot use the system at all). But this simplification certainly helps.
Abolition of the London Act appears to be the reason why Indonesia is leaving the Hague Agreement, effective as of 3rd June 2010. Indonesia, the world's fourth most populous country (and largest Muslim country), has been a Hague member (of the London Act only) for over half a century. However, it is only since 2001 (impelled to it by TRIPS) that Indonesia has actually had a registered design law.