I recently started using Tweetlater to automatically respond to Tweeters who follow me; and to schedule future tweets.
I read an article about someone who scheduled, way in advance, a whole bunch of Tweets, and did so using Tweetlater. It seems like a good idea, if not really in the spirit of Twitter. In the process I set up an automated response to those who follow me. I had already tied it into my blog and so all my welcome to #dafsfj and #tytewty appeared as blog posts.
In retrospect , I think this is a bad idea. My blog started to look a bit spammy and it does not provide any useful information to readers. Particularly as many of the potential Twitter followers are obvious spammers.