Valve announces they are looking to get some gamers up to their Bellevue, Washington offices to play test games and hardware prototypes. They offer a Valve Playtester Survey, and say they may be looking for testers from outside their immediate area, as well (thanks Develop). Here's word:

We're looking for folks to come to Valve and playtest both released and unreleased versions of our games as well as play around with some of our hardware prototypes. If you have interest in stopping by (most sessions last around an hour), please fill out the survey below. We're looking for people local to the Seattle/Bellevue area, but you're welcome to fill out the survey no matter where you live as we may have plans for remote playtests in the future.

Thanks for your interest in helping us make better products!

Click here to take the Playtester survey

UPDATE:

We are looking to add international support in the future. For now though, playtesting will be US only.