Once you master NXT plug synthesis, it's easy to create cables with custom length, as exemplified in the short cable above. You can also choose more flexible cables, round instead of flat cables...
Only one thing is really important: NXT cables are "straight" cables. That means that the same wire must be connected to matching contacts at both ends of the cable. With a flat cable, the connectors latches are thus placed on the same side, and on opposite face:
December 2006 update: several cables kits are available:
A more interesting application of synthesized plugs is to build "compatibility cables" that allows you to use your old RCX sensors and motors with the NXT. LEGO sells these cables through its education channel (see here), but they are not yet available as of this writing.
as of this writing, programming software of the retail version
of NXT kit (8527) doesn't support the use of some RCX sensors
such as rotation sensor, light sensor or temperature sensor.
The old touch sensor will work fine when used with NXT touch
sensor block. RCX motors will work too with NXT motor block
but of course all advance features that depends of the built-in
rotation encoder can't be used.
December 2006 update: