Tierney blogged about a pretty cool little open source project
called UltraVNC Single-Click.
Basically if you're running Windows and you need tech support
from me, I point you to an executable on my site and it gives
me VNC control over your system. What this means is no more 30min
tech support sessions with relatives walking them through the
process of troubleshooting a faulty device driver or some other
obscure problem over the phone ("what do you see now?"). No
matter what computer they're working on you send them to a URL
and take control of their system remotely and let them watch how
you fix it. And if you want to take it a step further and preserve
the solution as a movie so they can reference it later, use
this cross-platform VNC2SWF screen recorder (like camtasia only
for a VNC session).