In trying to create a team site for a department called .../Commercial/Content, I use short names (e.g. .../CML/CON). Apparently CON is some kind of a system no-no. I have not searched on this problem, so there may be information posted out there on this issue somewhere:

When creating a site in Microsoft Office SharePoint Server (MOSS) 2007, the URL cannot be ..../con

The system allowed me to do it, and it created the site, but the page was 100% blank.

Microsoft, how about popping up an error or something when an illegal system name is used, rather than allowing the site to be created?