How can I merge all my Google calendars into my primary one?

What's the best way to view multiple Google Calendars in one interface?

• I have a personal Gmail account and a work Gmail account.  Ideally, I'd be able to use iCal on my iPhone to view/edit both calendars.

• Answer:

  For now, what I've  done is: Read-only shared my work calendar with my personal gmail account Followed the instructions to set up my personal gmail as an exchange account on my iPhone: http://www.google.com/support/mobile/bin/answer.py?answer=138740&topic=14252 Followed the instructions to include my shared work calendar when sync'ing to my phone: http://www.google.com/support/mobile/bin/answer.py?answer=139206 This gives the read access to my work calendar and read/write access to my personal calendar from my iPhone, which is sufficient for me.