The ww sub-domain was in all likelihood setup to catch web surfer who mistaken type it instead of www. Your logs show it because someone had mistyped it and then ran a search which led to your site. Either that or the ww sub-domain is Google's homage to Webmaster World for this great resource.
7:28 am on Jan 13, 2003 (gmt 0)
Inactive Member Account Expired
Everyone should do so, because it is very cheap but effective way to increase usability of a homepage ;-)