nx still forwards NX, but it does compression and caching to eliminate most of the X round-trips:

http://en.wikipedia.org/wiki/NX_technology

It's generally a lot faster than VNC while providing similar functionality to X. You can forward just a single app (or all apps).

For example, when my friend comes over to my house to do some coding, he fires up NX and connects to his box back home. Up on his Windows desktop pops up KDevelop, kate, konsole, etc. They each show up as separate windows, as if they were local apps.

Thanks. NX looks interesting...I didn't realize it forwarded X so it should work with all X applications. Looks like you need a software component on both sides, though. If I want to run more robust X applications remotely in the future I will probably look into using this.