We are seeing this over and over by customers visiting, any ideas what it is:

[Wed Sep 14 17:07:23 2005] [error] [client 70.xx.xxx.80] File does not exist: /home/ouruser/public_html/cog

We have no reference to cog but it seems to be throwing customers (pretty consistently) the following error:

[Wed Sep 14 17:07:23 2005] [error] [client 70.xx.xxx.80] File does not exist: /home/ouruser/public_html/404.shtml