Just got the news today from an OSM mapper that Metro Manila
Philippines is now in Google Mapmaker
See this:
http://www.google.com/mapmaker?gw=10&ll=14.555339,121.05835&spn=0.295086,0.31826&z=12

I have to admit that it is impressive in many parts (but not as
detailed as where I am currently mapping). However, we all know it
ain't free as in freedom.

So again here's my OSM love campaign. Calling all OSMer! Please join
us in an online mapping party for Metro Manila Philippines. A couple
of minutes (or hours or days) of your time editing using the Yahoo!
imagery is most welcome.

Using yahoo imagery, we want to complete a "first pass" edit to many
areas in the metropolis (yahoo imagery in Metro Manila is pretty much
dated by our guesstimate: 5 years old, but still very much useful).

Before editing please consider the following:
1. choose an area where there is virtually no edits (this way we don't
mess-up other contributions);
2. we have "mostly" completed major routes (motorway/truks/primary)
so the remaining tags would be mostly residential areas;
3. add the tag highway=road.

Also have a look at the
http://wiki.openstreetmap.org/index.php/Yahoo!_Aerial_Imagery#Problems_with_tracing_Yahoo
for tips.