Have you checked out the Twitter service from AllYourTweet.com? It can potentially help you make a more effective Twitterer - below are some of the services they offer
Keep track of the growth of your accounts. AllYourTweet.com will track your followers, friends, favorites, and status update counts. Check out our nifty graphs of your numbers too.
From one view you can look at your tweets, your friends tweets, replies, and basic analytics on your top five accounts.
Not only can you shorten your urls but you can now track them too. Find out how many followers clicked your url.
Register all your twitter accounts under one umbrella so you can track them all with one login.
This integrates all your accounts into a themed twitter client.
Enter your future tweets and when the time comes we'll post the status updates for you.
RSS Feeds into Twitter
Enter your RSS Feed and we'll automatically tweet your blog. There is even an option to URL track your blog tweets so you can get conversion data.
Auto Follow and Auto UnFollow
Turn on this option and all new followers will be in turn followed by your account.