X User Howto (from the LDP)

Running Remote X Applications Mini Howto (from the LDP)

Man pages: X (main concepts), Xserver (X server concepts)

X FAQ (on http://www.x.org/)

Thin-client Howto Document (from the LDP)

Linux Terminal Server Project: http://www.ltsp.org/

Setting up LTSP systems (using quiet hardware): http://development.gbdirect.co.uk/xterminal.html

Diskless Howto Document (from the LDP)

X terminal pages: http://dns.solucorp.qc.ca/xterminals

Richard Kaszeta: Converting old PCs into Standalone X Terminals: http://www.menet.umn.edu/~kaszeta/unix/xterminal/

Man pages: xdm

XDMCP Howto Document (from the LDP)

Cygwin/XFree86 (Win32): http://www.cygwin.com/

VNC: http://www.uk.research.att.com/vnc/

rdesktop: http://www.rdesktop.org/

X Servers for Windows (and other systems): http://www.rahul.net/kenton/xsites.html

GPL Java X Server: http://www.jcraft.com/weirdx/

X Terminal/Diskless specific distributions: http://lwn.net/Distributions/