The easiest way to get traffic to your site these days is to get retweeted on twitter. if someone retweet your link it means he like it and his followers on twitter will see it and probably they will like it too. basically the more RT you get the more traffic your site will receive. reTweet.it is designed to make this process easier. if you retweet other members links you earn credits which you can use to promote your own link

Twitt.US is a free service allowing you to exchange tweets with other Twitter users to increase the exposure of your tweets. You post someones tweets to your own time line and someone else will post your tweets to their own timeline. You will always have to approve all tweets before they are posted to your Twitter time line. That way you can make sure only relevant tweets get tweeted to your account.