Theres a new tool out there called NinjaFollow. It's free and it can be found at http://www.NinjaFollow.com. The premise is simple: Twitter is an online directory of hundreds of thousands of people who are constantly changing their status updates. Your goal is to get as many people exposed to your content as possible, by getting "followers". NinjaFollow is a free script that lets you automatically follow massive amounts of twitter users at once. The premise being that the more people you follow, the more people will follow you in return. I can guarantee this works! After a day or two, once most of the people you've followed have returned the favor, you can then use NinjaFollow again to un-follow those people that aren't following you, so your account doesn't look spammy. Change your status several times a day to your affiliate link. Immediately you'll have thousands of impressions! Give it a try for yourself at http://www.NinjaFollow.com . You won't regret it.
..and in case you're wondering, the tool is only going to be free for a couple of days while it's in beta, so get on the bandwagon while you can.