I have recently published a project that I was working on to CodePlex, with the approval of my employer. This project was mostly done for the needs of the company, but I'm sure this thing can be of value to other programmers outside the company which was my primary motivation to publish it.
I'm reluctant to specify which project it is, to avoid the suspicion of this being a shameless plug and instead focus on the bigger question:
How can I lowly programmer such as myself give a pet project more exposure to the community at large, primarily to get more feedback not only in terms of bugs found but also in terms of direction that the project should/could take?