"Attention Brokerage" is one of the latest developments in the field of online advertising. The first Web-site applying the concept of selling and buying attention is Cybergold. Users, who want to earn money have to register and then look at ads, which, of course, they have to prove by e.g. downloading software. Attention, according to this idea, represents a good, which is worth being paid for.
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Caching generally refers to the process of making an extra copy of a file or a set of files for more convenient retrieval. On the Internet caching of third party files can occur either locally on the user's client computer (in the RAM or on the hard drive) or at the server level ("proxy caching"). A requested file that has been cached will then be delivered from the cache rather than a fresh copy being retrieved over the Internet.