Central Registry For Open Source Project Ideas?

allinoneplace asks: "I would like to start working on an open-source project, starting from scratch since IMHO, is very difficult to jump into an already running project (reviewing the code would take months for some of them), and I've been speculating about some ideas on my own. However, I would like to know whether there is some place where proposals for open-source projects are posted, so that people might take and start them. The other way around: Is there any place where you can post projects you think are interesting but you won't be able to start?" What are your thoughts? Do you think the Open Source community really needs such a service?