A short list of products that ship with Debian pre-installed.
[http://www.tekmote.nl/epages/61504599.sf/en_GB/?ObjectPath=/Shops/61504599/Products/CFL-001 Lemote ?YeeLoong 8089 8,9" ultra mini-laptop orchid]
[http://h71028.www7.hp.com/enterprise/cache/433095-0-0-0-121.html HP ?ProLiant & ?BladeSystem servers]
NETGEAR ReadyNAS http://www.readynas.com/ 1 http://www.netgear.com/Products/Storage.aspx 2 shipped with sarge and a modified kernel