what I see a lot of is the below. There are a lot more lines of similar code.
[Tue Feb 22 20:25:27 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/404.shtml
[Tue Feb 22 20:25:27 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/favicon.ico
[Tue Feb 22 20:25:26 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/500.shtml, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:25:26 2011] [error] [client 78.105.43.233] SoftException in Application.cpp:601: Directory "/home/terapvpc/public_html/community/install" is writeable by group, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:25:11 2011] [error] [client 86.28.168.180] File does not exist: /home/terapvpc/public_html/404.shtml
[Tue Feb 22 20:25:11 2011] [error] [client 86.28.168.180] File does not exist: /home/terapvpc/public_html/favicon.ico
[Tue Feb 22 20:25:10 2011] [error] [client 86.28.168.180] File does not exist: /home/terapvpc/public_html/500.shtml, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:25:10 2011] [error] [client 86.28.168.180] SoftException in Application.cpp:601: Directory "/home/terapvpc/public_html/community/install" is writeable by group, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:24:23 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/404.shtml
[Tue Feb 22 20:24:23 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/favicon.ico
[Tue Feb 22 20:24:22 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/404.shtml
[Tue Feb 22 20:24:22 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/favicon.ico
[Tue Feb 22 20:24:22 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/500.shtml, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:24:22 2011] [error] [client 78.105.43.233] SoftException in Application.cpp:601: Directory "/home/terapvpc/public_html/community/install" is writeable by group, referer:
http://xenforo.com/community/threads/internal-server-error.12655/
[Tue Feb 22 20:24:13 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/404.shtml
[Tue Feb 22 20:24:13 2011] [error] [client 78.105.43.233] File does not exist: /home/terapvpc/public_html/favicon.ico
[Tue Feb 22 20:23:34 2011] [error] [client 98.100.160.88] File does not exist: /home/terapvpc/public_html/500.shtml