Help with Twitter: Multiple Accounts

After twuating a bunch of Twitter names, I now have a problem of managing these various accounts. Most of these twuats aren’t frivolous. Some are experimental to see what local businesses can do with Twitter. Some are to introduce the power of social networking, and some are simply to protect a business’s twats from twuating.

So is there an easy way to monitor these various accounts for any possible conversations? Currently, I log into each account via the web to see if there are any @replies (direct messages work fine since they’re emailed). On the iPhone, Tweetie makes it convenient to quickly switch to different accounts, but I still need to manually make the switch.

It would be so much easier if the timelines of the various Twitter accounts could be aggregated into one “master” account. Logging into that one master account, I’d see the tweets and replies of that account but also all the @replies for all my other “sub” accounts. But that’s just one implementation. I’m sure there are others.

Any ideas?