Tel Aviv-based do@ ("do at") is an intriguing new iPhone exclusively right now mobile "search engine" that takes a very different approach to delivering content on the go.
The company doesn't index pages. Instead it shows live sites or apps that have been optimized for mobile presentation. It's similar to Google's preview functionality for mobile but all the pages on do@ are live and not cached.
Rather than index thousands or millions of results, do@ presents a relatively small number of sites for each category. Sites are ranked initially by default but later those rankings change if you're signed in to Facebook and/or you "favorite" particular sites. You can create a kind of personal ranking of sites by using the "heart" button associated with each page.
Do@ is a very effective way to get to certain types of content efficiently without the need to click back and forth between pages and results or enter long query strings. Interestingly, users can also get to Google Places listings very effectively through do@.
Watch the video below to see do@ in action: