If you are looking for a way to better manage your Twitter account and you aren’t quite ready to hire a web savvy Viritual Assistant, you may want to check out Bright Kit.
BrightKit is in beta and for a limited time you can add multiple twitter accounts.
The only features available right now are the ability to manage multiple accounts, schedule tweets for a later time, search, read your dms and @ messages. Personally, I am looking for features that move beyond what Twitter already provides.
There are some great ideas being submitted so hopefully BrightKit will take the time to develop some of their users suggestions.
A heads up, unlike some other Twitter management applications, if you post using BrightKit it will be listed on your Tweets.

The Dashboard is great. Easy to navigate. I like the search feature, though when I click a user link, I seem to be directed to a 404 error page.

I will keep an eye on BrightKit, but in it’s beta version it simply does not have enough management features for me to consider it as an alternative to the service I am currently using.
Right now I would say BrightKit gets a 3.75/5 , though the thoughtful user interface and the fact that they are seeking user feedback makes me think it will quickly reach a 5/5.

Thanks for checking into BrightKit and please keep us posted. Managing multiple Twitter accounts is good for business.