Last night's BaltoMSDN presentation by Mike Wolf was on Windows Phone 7 development. When I heard that all apps would need to be certified by Microsoft, I thought, "Oh, No. Here we go with the oppressive oversight". But after a little surfing this morning regarding mobile OS's and security I came across this white paper describing how the entire Android OS could be infected with Ad/Malware.
Let's hope Microsoft get's security right on the WP7 but is not as oppressive as Apple in app certification.