Shell command question

[steve at iwsys.com]

I use the following command to have a scrolling screen of all denied 
requests to my squid web cache:

tail -f /var/log/squid/access.log | grep DENIED

How would I do the same and have a small list of lines to exclude in the 
results.  I want all denied requests except those to real.com and the ad 
servers I block.

I know there are a million ways to do what I want, but I'd prefer a one liner.

Thanks,

Steve