I just found that you can edit the title of a thread you started, I'm new to vb forums, I don't know if this works on other vb powered forums. To change the thread title you have to do double click near the title on the list of threads. I'm a the last one to know it? Is it a default feature on Vbulletin?
you can edit a thread title in 5 minutes of posting it! after that it is not possible. there was a similar thread, where shawn told this. EDIT : mods can change the thread title!