I made this for work and I though it'd be useful for other designers and devs.
This is a free Photoshop file that includes layers portraying the top 10 screen sizes / resolutions globally, as of March 2014, according to https://www.w3counter.com/globalstats.php (which claims stats from 74,260 websites).
This free PSD becomes even more useful if you pair it with the Chrome add-on called Window Resizer (https://chrome.google.com/webstore/detail/window-resizer/kkelicaakdanhinjdeammmilcgefonfh). Window Resizer lets you create your own sizes, or install somebody else's presents, so I made a set matching the global stats and exported it. It's included along with the PSD in the attached ZIP.
You might need Photoshop CS5 or above.
keyboard shortcuts: ← previous shot → next shot L or F like Z toggle zoom