To clarify, it doesn't bother me at all that Google et al. are making finger-friendly UI redesigns -- nor that the iPhone's popularity triggered it. What bothers me is:

1. Using UA as the only method of selecting the UI.
2. Hard-coding dimensions instead of designing it more generally; like the greasemonkey script does.

These both stem from the short-sighted view that they need to design for the iPhone, not for a whole generation of touch-screen devices.