There's more to becoming a game tester than you might think. Of course, a certain amount of skill regarding basic game play is necessary; so are good documentation abilities! The job is to spot errors, and while some are fairly straightforward ("hey, if you go too far to the left here, parts of the scenery disappears!") others are more complex, requiring several paragraphs of explanation. As a tester, you will usually receive the game when it is anywhere from 50 to 75 percent done, and one thing that the programmers and your employers will expect is a a steady stream of feedback.
Game testing can be a lot of fun, but keep in mind that it can also be very demanding. You'll be working under tough deadlines, just like the rest of the company, and you'll be expected to provide feedback to make sure that the game itself runs smoothly. Spoken and written communication skills cannot be emphasized enough in this kind of work.
Of course, the easiest way to get involved in game testing is to know someone in the industry. While it's not all about who you know, it certainly doesn't hurt. The nice thing is that it's not that hard to get to know people. Check the forums of your favorite game designers, be polite and jump on any hint of an offer of game testing, because, face it, that's exactly what a hundred other people will be doing as soon as they see that offer.
Game testing can be a full time job, and in many cases can be a very lucrative option. This could be a good way to get your foot in the door in the industry if you don't have a background in business, design or programming, and even if it ends up not being your final destination, you will definitely have played a lot of video games!
David is a Full-Time Video Game Tester. For more information on Becoming a Video Game Tester, please visit this Game Testing Guide.