Google announced yesterday, a new Refine Search feature named Numrange search. This is a pretty neat feature, that I know I wanted in the past. It can be used many ways.
Just add two numbers, separated by two periods, with no spaces, into the search box along with your search terms.
(1) inventions 1850..1899 (2) DVD player $250..350 (3) 5000..10000 kg truck
And many other uses. I posted a thread about this feature at Cre8asite Forums.