YellowAPI functionality can be integrated in a mobile phone with the Yellow Pages Android SDK. This kit in particular contains an improved sample app with auto-suggestion. Additionally, it includes an added GetTypeahead definition and bug fixes on API requests. To create a project, users need to add the YellowAPI developer key to Android and the Google Maps API key to layouts/map.
ResultR deserves mention as it's a meta search engine mashup built by two self-described "Web 2.0 Kids" as a high-school project. With it you can create your own search engine by choosing from 30+ sources you might want to include in your results.
When Microsoft launched their much-touted new search engine Bing last week it generated a lots of press and despite a somewhat muted expectations, it turned-out to be something of a hit. But lost in all the broader buzz about Bing was some news for developers: Bing has an API (we've now added a new Bing API Profile with technical details).