Hello,
Not that many subscribers to this list would need such a thing for themselves, but I wrote a brief OSHW intro for the April edition of RS Components eTech magazine:
http://is.gd/M0gAqK (Note: it's a 5.5M PDF!)
Though, this may come in useful if someone asks what OSHW is, and some of you may recognise the photographs from OSHUG meetings.
Cheers,
Andrew