Billable vs. non-billable hours

I was wondering if you could share with me your approach to billable vs.
non-billable hours.

Do you bill for all the time spent working on a given project, no
exceptions?
Or do you consider all these additional tasks involved in working on a
project to be non-billable time. (things like communicating with the client,
preparing website documentation,  time spent on the phone with the client's
web hosting company :-), etc. )
If so, on what basis do you make the decision whether to bill for something
or not?

Can you give me some pointers here?
Thanks,

Kasia Whiteis
mailto:kasia(at)whiteis.com
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