Cv 0 comes with a raft of new and improved features, including:
However, whilst the server is now ready for production use - indeed, on non-Unix systems, administrators are encouraged to switch as soon as possible - most administrators will be waiting for the release of compatible versions of mod_perl and mod_php before making the upgrade. So far, neither is ready.
The new release (and version 1.3.24) does have a few known bugs, notably with cookie handling and buffer sizes in mod_proxy. If cookie-handling with proxypass directives is important to you, you should stick with 1.3.23 for the time being :-)