Finally, I have a new "tool", a little brother for my virtual die roller.
FreezeTweet is a Twitter client, that allows you to block ("freeze") hashtags, making it easy to re-use them.
If you're live-tweeting what's on MTV for instance, type #MTV and click on it : It is now frozen, all your following tweets will start with this hashtag.
All this goodness is still very much in beta, there are some bugs that I'm working on, and certainly more that I haven't even seen yet. :)
I've created a new twitter account for this app, @FreezeTweetApp.