- Hotmail (Gmail)
- Mapquest (G Maps)
- Firefox/IE (G Chrome)
- iOS (Android)
- Apple TV (G TV)
- Twitter (G Buzz)
- Facebook (G +)
- Groupon (G Offers)
etc.
- Google (AltaVista/Lycos/etc)
And oftentimes when they do play catch-up they certainly don't have to for long. If anything, for the first three any catching up to do is going to be the other way around.
Taking a core product and improving it is one of the main pieces of advice in this community. I don't see why there should be any negative connotation for a larger business doing it as well. And for the record, I don't see a single product on the left-hand side of that list that wasn't "in response", "playing catch-up", or a derivative idea from someone else's hard work.
It'll probably fly better, too, since it'll integrate with the rest of the google services, and help google use us as a product...
Now only for it to start in a city I live in.