Search whois by registrars (i.e person or company’s)?

I would like to know where I can go to search domains a certain person or company owns? (or have owned)

IE ; type in “billgates” or “microsoft” and get a list of ALL websites registered to him or the company.
In reply to the first 2 answers received:

Answer no. 1 – I cant access the link you’ve sent me.

Answer no.2 – That search funtion only looks for keywords in domains and doesnt actually search through the contact details registry.

Thanks though!

Any one else?
Magix – Very intersting links, thanks, but still havent found what I’m looking for.

Keep em coming!