Webmasters have several ways to keep their sites' content out of Google's search results. Google is providing webmaster a new feature to help them "opt out" of having their website(s), or content(s) that Google has crawled from the search results on "Google Shopping, Advisor, Flights, Hotels, and Google+ Local search."
"Webmasters can now choose this option through our Webmaster Tools, and crawled content currently being displayed on Shopping, Advisor, Flights, Hotels, or Google+ Local search pages will be removed within 30 days," stated Cutts on Google Webmaster tools blog.
In other Google news, Google just added a new feature that shows resutls of "similar searches" on its Google.com search results pages.
Usually Google removes one or two keywords from a search query or replaces them with similar keywords if there aren't many relevant search results for your original query.
However, some of Google's suggestions remove important keywords from the query and that's a mistake.
For example, if you search [google maps flash html5 api v4], Google now shows results for searches like: [google maps flash html5 api], [google maps html5 api v4], [google maps flash api], [google flash map api].
(Thanks Alex for relates searches tip)
Update: Google opens a trial with ten schools in the Cape Town area, which will receive "wireless broadband over a TV Shite Space network."
"White spaces are unused channels in the broadcast TV spectrum."
"The service will be broadcast from three base stations located at Stellenbosch University's Faculty of Medicine and Health Sciences in Tygerberg, Cape Town," stated Google.
During the trial, "we will attempt to show that broadband can be offered over white spaces without interfering with licensed spectrum holders. To prevent interference with other channels, the network uses Google's spectrum database to determine white space availability," google explains.
To confirm results, the CSIR Meraka Institute will take spectrum measurements and frequently report back to ICASA and the local broadcasters.