I'm quite the fan of BusyMac Software's very excellent BusySync application for Mac OS X. It's always been a great (and ridiculously easily ) way to share calendars over your local network using the Mac's built-in zero-config Bonjour technology.

Today at Macworld Expo, the company has announced that an all-new application, BusyCal, is coming later in the year. The application, which is marketed as iCal Pro, promises 'the beauty and simplicity of iCal with the power of BusySync's ... calendar sharing and syncing technology'.

On top of all the regular calendaring that you'd expect, the application will ship with:

• Bonjour, iPhone & Google Syncing
• Multi-user editing
• Calendar permissions and security
• Offline editing
• Graphics, icons, themes and sticky notes
• Weather
• Rich text

The application, when it ships, will require Mac OS X Leopard and cost $40 per computer. If you already own BusySync, or purchase it before BusyCal ships ($25), you can upgrade to BusyCal for $10.