life is integrated with google, not iPhone
i am one of those in the camp of switching to an Android mobile device; after of course a better design comes out other than the crappy T-Mobile version.
i use google calendar, gmail (and contacts), google notebook, google health, google voice, latitude and more. up until now Apple (and AT&T) have been pretty playing in the same sandbox with google pretty well; however, with these latest waves of rejections by Apple it really makes me want to leave iPhone.
do not get me wrong, i LOVE iPhone... in fact, i am currently on my 17th (or so) one because i buy new ones when i break my old ones (drop, water, alcohol, whatever) so i am for sure a fan of the device and all things apple; however, with my life (critical life pieces) so closely integrated with google it seems to make sense that i go the android route so that i can take full advantage of the services i chose to use.
YMMV but this is my opinion