Here's my thing with Mobile Me. Yes, push email, calendar, etc is all well and nice but with push notifications now part of the iPhone, "push everything" will become a standard/expected feature for Google, Yahoo, etc and they will comply.
So I know if I were to plunk down $99 for the first year then a month in, Google will come along and say "push mail, calendar, turd-control ... all for free."
So, no, I will not buy into Mobile Me. I'm waiting on Google.