Far as I can see, AWStats can't single out a single IP. This is the demo: http://www.nltechno.com/awstats/awstats.pl?config=destailleur.fr

I'm trying Google Analytics now, but I think the best thing you can do is use grep on a linux box to do this:

$more logfile.log | grep "123.123.123.123"

That should output every logging of that specific IP address.

**Edit: I also just found this list via Apache's log documentation: http://www.dmoz.org/Computers/Software/Internet/Site_Management/Log_Analysis/Freeware_and_Open_Source/ **