Marketing on twitter has its uses, but without the right tools your missing out. So i have put together this list of twitter tools, software and other resources that will help you. Help with scheduling your tweets to go out at the time and date you set out, These are some of the better ones ive found. all are free, but some do offer a more advanced premium package. Should you ever need it. Also i would like to hear what you think about each of the resources i provide you with, so please leave a comment.
also lets you save drafts of tweets that you can use over and over again. Also use your own URL shortening service, and also schedule tweets to a multiple of Twitter accounts. You can also make money with social oomph by joining there affiliate programs HERE
Hootsuite is one of the most populer Twitter client, Access hootsuite via its web site or from any number of special desktop apps and browser add ons.
Not only use for Twitter, But you can also use it for other social networks like Facebook, Myspace, Linkedin, etc. Also has the option to save drafts, and has follow management tools also.
Made for organizations with muiltible Twitter accounts and/or Twitter members that work as a team. Also has a lot of other advanced features.