The current system supports:

Online viewing/search

RSS subscription

WebDAV/Webcal subscription

All calendar agents compatible with IETF 2445 .ics format

e.g.,
     - Google Calendar (Win/Mac/Linux) Publicly Editable
     - Mozilla Calendar (Win/Mac/Linux) Read-only
     - Microsoft Outlook 2003/2007 (Win) Read-only
     - Apple iCal (Mac) Read-only
     - KOrganizer (Linux) Read-only

What else you want?

A quick view of the web interface:

(Click on the picture to see more info)

Subscription via Google Calendar:

(Click on the picture to see more info)

Subscription via Mozilla Sunbird or Thunderbird+Lightning:

(Click on the picture to see more info)

Subscription via Microsoft Outlook 2003/2007:

(Click on the picture to see more info)

Subscription via Apple iCal:

(Click on the picture to see more info)

Subscription via KOrganizer:

(Click on the picture to see more info)