One of the good things that Pres. Gloria Arroyo did was to properly recognize key Islamic holidays in the Philippines. I think most of the dissenting opinions from the Islamic communities in the Manila is that they felt that they are not part of the Philippines because they are just ignored. There’s a grain of truth in it and including some holidays to our National Holidays is a good step.
Based on this site, Eid-Al-Fitr (End of Ramadan) will fall on Sept 10, 2010. Eid-al-Adha (10th Zul-Hijjah) will be on November 16, 2010.
PS: Finally, Gloria has declared Eid-al-Adha as a national holiday (link).