what is the smallest screen resolution that I should care when building a website?

Question

So what's the lowest screen resolution, especially width, that I should consider when building a website.

Answer 1

Here is the link which show browser resolution statistics and trends yearwise -

Browser Display Statistics

It shows that as of 2012 -

Date   Higher     1024x768 800x600    640x480    Other
2012   85%        13%      1%         0%         1%