Finding more sources
Websites' own search engines don't always dig up everything if they're poorly archived. Use the command site: in Google, and compare the difference, it will often find more pages.
    adopt site:www.cat.org.uk
(and compare to searching for "adopt" in the site's own search engine)

Quickly finding numbers/statistics
Give the search term(s) and then an estimate of the upper and lower numbers divided by three periods.
    Average price house 200000...300000
    Washing machine price 300...400
Two or four periods won't work, it has to be three; and the numbers mustn't be punctuated. It's not perfect (it'll also pick up things with names that include those numbers), but can be useful.

Finding the phone number of a press spokesperson
Using the city code where the office is located, the name of the company, and press (or equivalent in the local language) will often produce a result.
    020 siemens press