I've just looked at my server error logs on 1and1 hosting and have found some odd looking pages:

217.160.233.109/w00tw00t.at.ISC.SANS.DFind:)
217.160.233.109/msadc/..À¯..À¯..À¯../winnt/system32/cmd.exe
217.160.233.109/scripts/root.exe

217.160.233.109/Ads/adxmlrpc.php
217.160.233.109/a1b2c3d4e5f6g7h8i9/nonexistentfile.php
217.160.233.109/ads/adxmlrpc.php
217.160.233.109/adserver/adxmlrpc.php
217.160.233.109/blog/xmlrpc.php
217.160.233.109/blog/xmlsrv/xmlrpc.php

It's the first three that i find most odd, although I don't have any directories anywhere that would relate to the blog entries.

Should I be worried about these?