What do you use for remote support for remote Windows and or ‘nix boxes?

LogMein(Rescue)or other LMI s/w,
VNC, Dameware, Remote Desktop,
Remote Web Workplace (for Windows
SBS Server environments?

I just wanted to get feeling for what the most used/popular remote support s/w tool currently being implemented in the IT support arena.

Also, how do most IT shops/techs bill for remote calls; per incident, annual contract or hourly?

Thanks.

Have a great day!