If there is more than one person tweeting for your company you might want to consider using this new software that adds many features to a company’s twitter-based branding efforts:
Multiple Accounts and Multiple Users
Manage up to five Twitter accounts through a single CoTweet login. Invite colleagues to join your accounts to work as a team representing your company on the front-line of your Twitter presence. Add your personal Twitter account and manage all your updating through one interface.