Tweet Later – Schedule Futue-Dated Twitter Tweets
http://www.tweetlater.com/

Now YOU Can Schedule Future Tweets For All Your Twitter Accounts. Stuck on an aircraft? Back to back meetings? Taking vacation? Running errands? Playing with the kids? Keep your Twitter stream ticking over with new tweets even when you’re not in front of your computer. Or, use it as your personal reminder system. PLUS… Send automated thank you notes to new followers, and automatically follow new followers, if you choose to do so. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.