@RonPK: Search suggestions are available for Wikipedia, Yandex (in selected areas) and Bing. Others will follow.
- opera:config#Geolocation|LocationProviderURL can be changed to point to any url or even a local file.
- Geolocation can be disabled completely in advanced->network
- When geolocation is action for a site (because you have accepted it), there is an icon in the address bar you can click on to disable it again or change other options.
This is all opt-in and the user gets a non-legal speak introduction to what this is about before enabling/disabling it. W3C Geolocation is becoming more and more common in many social services and I don't think anyone can afford to not implement it anymore.