OT: Monitor/LCD color calibration solution?

I've read some reviews and had sales pitches on several different 
hardware/software monitor/LCD calibration solutions.  I'm looking for 
something that is reliable and consistent since we now have two offices and 
probably three monitors that should be calibrated at each.  At this stage, 
our monitors are all relatively good quality, but not top-of-the-line 
studio/artist specs.

Apparently some solutions are really sensitive and tend to give different 
results each time, whereas others may not be sensitive enough.  Some 
apparently also remain attached to the monitor and adjust it automatically 
based on ambient light.

What do you use/prefer/find works?  Opinions, suggestions?  Calibrating 
printers would be a bonus, but isn't mandatory.

Thanks,

Sean