what is the cheapest and fastest way to find out who is the owner of a
car based on its Ontario license plate?

Dear Drizztfather, 

In order to find the owner of an Ontario license plate, I suggest
you's contact the Ontario Ministry of Transportation:

<http://www.mto.gov.on.ca/english/dandv/catalogue.htm> 

(The specifc product is: 
Vehicle Abstract - Plate Search as of a Specific Date
<https://www.tips.mto.gov.on.ca/mto/srcat.nsf/HTMLProductOrder?OpenForm&ParentUNID=06c2ca34b90445e3852564ee0077be39>).

There is a fee for this query, but this is the official source, any
other source (private investigators, etc.), would charge more and be
less effective.

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it, My search terms were:
[Ontario "license plate" find owner]

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Request for Answer Clarification by drizztfather-ga on 15 Apr 2006 07:09 PDT

Thank you -- I've already asked (and paid) for this. They will take
10-15 days to answer by mail.  I was only wondering of there was a
faster way, and you have answered my question.

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Clarification of Answer by politicalguru-ga on 15 Apr 2006 08:34 PDT

No problem. I am sorry there is no other way...