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.
Technology blogger Mohamed Marwen Meddah wrote an interesting post recently on his StartUpArabia site: "The Importance of Having An API for Arab Startups". Mohamed notes that, thus far, relatively few Arab online startups have opened up their platforms through APIs. However, he believes that providing an API is crucial for Arab online services.