You know me, I don't like to complain

I want an Applescript or something similar to look at my shit in iCal, and export a subscrib-able calendar of my availability. I don’t want details of my appointments in the exported calendar.

I just want someone to look at this and know when I’m free, or when I’m busy.

Help!

UPDATED:

Yes, I have like 10 calendars in iCal. I want them all combined into a unified free/busy calendar that has no details on my appointments.

Sorry for the ambiguity.