[ale] blocking adds at the Firewall?

[christopher at bergeron.com (Christopher Bergeron)]

Hey guys, I think this is an easy question, but for some reason I'm 
drawing a blank on the best way to go about it.  I basically want to 
block advertisements from doubleclick.net, atwola, et tal... What's the 
best way i should do this?  Should I deny the packets at the firewall, 
or should I put an entry into my internal DNS for these servers?

Also, does anyone have a quick list of the biggest/baddest ad servers to 
block... ?

Thanks in advance,
CB


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