Conference sessions are available in .ics format here.
Here's how to subscribe to conference information via iCal:
Assuming you have an application that supports the ics format (like iCal), just click on this link:
webcal://conferences.oreillynet.com/where2006/where2006.ics — you can accept the default subscription options, though you may want to ask it to refresh less often (schedule changes to the conference will be infrequent, so there's really no need to have it update more often than every couple of hours or so).
The times are local time for the conference — Pacific Time. If you're in another time zone, the times will adjust accordingly. So a session that starts at 09:00 Pacific Time would appear as an 12:00 event to someone who's clock is set to Eastern Time.
You may want to adjust your iCal views a bit — in the default interface, it can be difficult to work with time slots that hold several sessions. Turning the "show search results" panel may help, as you'll be able to see (and select) the sessions as a list. You can use the info panel to show more details about each session.
Using "Show info" and "Show search results" (circled in red, near the bottom here) can be helpful when selecting individual sessions and viewing details in the info panel.
Enjoy! If you have questions or difficulties with the calendar, send email to