You should make one for Stack Overflow: when you ask a SO question, you're literally stuck until someone answers it.
If yes, then try using http://twitter.com/updt_me to 'follow' the questions - you'll get a DM whenever there are new answers in the RSS/Atom feed! :)
It's a self-learning project I built over a weekend, so it's kinda rough around the edges, apologies in advance! Do let me know what you think.
Good luck and tell me what you think. Also, any feedback would be truly really appreciated.