This SDK can be used to integrate the Open Sentence/Speech Understanding API into Android applications, enabling the retrieval of semantic meaning from inputted functions.
Using AlchemyAPI and Python scripts, this tutorial walks followers through downloading large numbers of PDFs and using entity extraction to determine the most popular topics.
Life on the web is full of search terms and human filtering. Even good results often require some effort to determine which has the information we seek. There are several services attempting to help with this problem and they're making their applications available via API.