getting DNS from DHCP IP address

[David Banning]

My problem is that the server I use for DNS keeps going dead.

My ISP is most familiar with windows users who get their DNS
automatically from their connection.  When my ISP gives me a good
DNS server number, it seems to go dead six months later, and I have to 
call them again.    

Is there a way to get DNS automatically, say from the DHCP connection IP
address given to me? or, is there some great free DNS server that will 
stay in business for some time that I can plug into my resolv.conf?
I am in Toronto, Canada so I guess a DNS should be in reasonable proximity.



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