Sure, it's useful -- in fact, I really need to schedule tweets, but have been procrastinating in finding one. This post made me do the 3 second google search and I chose http://twuffer.com -- not a great name, but free, easy and has the features I need.

There are a ton of products (free and commercial) that do this -- but only one had a name that made me not even want to find out if it would be useful to me. No comment on this page discussed anything about whether it was good (in fact the non-name comments I see are negative) -- my guess is that, like me, no one is really giving it a serious look.

I think it's legitimate to factor this reaction into your naming strategy.