Multiple twitter account management has been made easy with a free service called Social Oomph. Here’s the link. I personally use this service and it’s worth every cent, especially because there’s a free version.
If you’re tired of having TweetDeck or Twirl open on your desktop just to keep your followers up to date, you can use Social Oomph to pre-write your tweets and schedule them to go out whenever you want.
The service supports multiple Twitter accounts and is very intuitive to use. I personally use the upgraded version of the service and recommend you upgrade if your time is limited and you want to get aggressive about your marketing.
Click the banner below for more information. Also, if you have any questions about how I personally use Social Oomph, send me an email at email@example.com.