Amazon recently launched their Jungle Disk online storage service, which offers a WebDAV server, similar to .Mac, at rock bottom prices. One can get 20GB of storage with 2GB of monthly transfer for $3.40 per month. Box.net offers 1GB of online storage with WebDAV for free. Publishing to any WebDAV server is just as simple as publishing to .Mac. Systems Boy has a great tutorial for how to do this on his blog.
Alternately, if you already have web hosting, and don't feel like setting up a new account at Jungle Disk or Box.net, Scalp makes it possible to publish your calenders to any server with FTP, SSH, or SFTP.
Via macosxrumors and Hawk Wings