I used to use Magpie - Twitter Advertising - Home Page but i felt it was too spammy for my followers.
SponsoredTweets got stupid new rules that you need to have a minimum of X tweets, member of minimum X days etc.. but I'll just wait and see how it goes
I'm getting a big fan from this tool: Buy Retweets For Twitter - reTweet.it Some people let me retweet quotes which I like (you can choose ofcourse) and from that I can later on get some free retweets from others
Thanks for the link. I've joined other services like this but not so much activity from them. I hope we'll be able to earn money from this site.
Nice idea to make money from Twitter. Thanks for the information.