Wolfram Alpha PHP Library is available to interact with the API. Essential operations include built-in data, algorithms, and methods. A wide number of topics can be found using such operations. Examples go from math, measures, and data analysis, and weather to transportation, education, and nutrition. PHP language could facilitate access when developers find fast implementation, community support, and PHP frameworks. Developed by Mathy Lorenzen.
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.
Sometimes we forget what the real purpose of all this fancy technology is. And what is that? To make our real lives easier. Mashups often help with that, allowing us to do such simple things as find a good beer, our favorite music artists, where the streetcars are, or where a park is.