ltsp fat clients...

http://jonathancarter.org/2010/11/24/how-do-ltsp-fat-clients-work/

https://help.ubuntu.com/community/UbuntuLTSP/FatClients

http://wiki.debian.org/DebianEdu/Documentation/Squeeze/HowTo/NetworkClients#Machine_type_selection_based_on_the_network