There's a Society for One-Place Studies now! While I'm disappointed that the free listing of one-place studies appears to be gone, at the same time I'm quite excited about the creation of this society, and have already joined and registered my one-place study.
For only £10 (currently about $16.37 Canadian) a year, plus a one-time registration fee of £10 for each study registered, you get access to the forum, a regular e-newsletter, an email alias (mine's email@example.com), and a page for your one-place study in the listing.
If you have a one-place study, you should consider joining. And if you don't have a one place study, you should consider starting one! They're a great way to add local context to your genealogy.