Highlights from the release notes:
- Completely re-written contact form with support for multiple attachments, better security and spam protection and better support for Windows servers.
- JS-Kit commenting for blogs. If you were using the previously built-in Haloscan comments, everything works just fine, whether you migrate your account to JS-Kit or not.
- Improved Safari 4 support
- Better RSS handling
RapidWeaver 4 requires Mac OS X 10.5 Leopard and is $79 US.