if you are doing some kind of load balancing with your 2 internet connexion - i'm not sure if this will help:
http://www.faqs.org/docs/Linux-HOWTO...OADSHARE.OTHER
an example there sets port 25 access to go through a specific link. you can apply it with http requests (port 80)
BUT
if you do this, all http requests will go to eth1 and i don't think squid has this kind of feature (make http requests to a specific link).
hth.
