The event scheduling plugin I’ve created for WordPress is now available for download at RSVPMaker.com. The plugin is on several years of working with community and professional organizations and political campaigns and is designed to support a range of usage scenarios. It uses the custom post types feature introduced in WordPress 3.0 to allow you to organize event postings separate from blog postings, list them in chronological order (or on a calendar display), and solicit RSVPs. You can also collect online payments using PayPal (some manual configuration required).
I’m interested in feedback on how it can be improved, both in terms of programming and user interface. I haven’t yet submitted it for public release on WordPress.org, but plan to shortly.
For a more detailed explanation of how it works, see What You Can Do With RSVPMaker.