Dell Latitude D505
This laptop work fine as a Roaming Workstation in Debian Edu/Squeeze. It also work as a LTSP diskless and thin client. The wireless network card do not work out of the box. It need some non-free firmware (b43).
The installation do not need any extra quirks. It ask for firmware, which can be provided for those that want to use the wireless network.
Sound work out of the box