Well all the stats programs are open source and well documented on the net. for example AW stats has a config file that you can do all sorts of neat things with outside of the base install. (of course, it gets overwritten by cPanel in an attempt to keep logfile processing at a minimum) but fun to see what you can do none-the-less.
I'd imagine you could write a log analyzer in php or perl to find matching patterns, then remove them from the logs before you view them. I can see problems there though unless the script is carefully written not to hog all the cpu.
Its possible you can block the offending domain from httaccess as well. That way if their bots are coming in from xyz.com they cannot connect to your server, therefore no logs. Those bots might not even come from the domains listed but it might be worth a try.
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