These documents are slightly old, as in published in late July 2006, but very much worth a read and a potentially useful as a checklist for those customers without servers in their environment.

Protecting Client Computers from Network Attacks.doc

Securing Remote Clients and Portable Computers.doc

Securing Windows XP Professional in a Peer-to-Peer Networking Environment.doc

Link to Download details: Small Business Security Guidance

ttfn

David