Google Voice isn't a good example of what I'm talking about (so, I guess that makes this off topic), but take Google Goggles for instance, where is the benefit of them porting that to iPhone? - I'm genuinely interested here. Surely there is more money to be made from people having Android which is loaded with Google, to supporting more sales of iPhone.
If they can help the carriers get more people using smart phones, they are happy. The android vs. iPhone stuff is just the small battle. The war is Internet use vs. Anything else (jogging? Sex? Swimming? And other activities google can't target with ads)
Out of interest, I wonder how much money Google actually makes from mobile Safari usage? Ie, if you took away Google search + Admob integration into the iPhone, how much benefit would they still have? (Even worse, replace it with Bing search, so that most searches the user does on their phone see Bings in-search advertisements)
Would be interesting to see the stats on how advertising goes in mobile optimized websites, and just how likely a user is to click on an ad-link while using their phone browser. I know my mobile browsing is either reading stuff, or looking up information I want to see, then getting out, whereas on a PC I'm more likely to wander around the internet earning money for Google.