I have a Pantone huey
and I found that once calibrated there was a very noticable difference to the colour profiles on both my 19" Gericom monitor and my 24" iMac screen. Skin tones are much more lifelike and in general the colour in photos seems more correctly saturated
I would highly recommend the huey for it's ease of use and small size. The unit also doubles as an ambient light monitor which adjusts the brightness of your display dynamically to the light in the room. There's a small cradle which it slots into so you can site it by your monitor or in the case of my iMac I've got it stuck on the glass around the border of the screen
The software is very straightforward and once installed it takes all of a minute to get a profile set up and working. The software also reminds you at intervals to re-calibrate your display.
I've not found a restriction on the number of computers you can use this on - I've used it on both of my displays and several of friends and family. It's simply a case installing the software, running the calibration and that's it.
A huey costs between £50 and £70 depending on where you get it from. There is also the huey Pro which manages multiple monitors connected to the same machine.
You may also want to consider the Spyder2express
. The unit is quite a lot bigger and doesn't double as an ambient light monitor but is compatible with a piece of software from www.homecinema-fr.com
called HCFR colormeter. This allows you to calibrate your television (as used on HDTVtest.co.uk
- a TV review site similar in approach to Camera Labs). The Spyder2 costs a bit more but will allow you to get the best out of both your computer screen and your TV.
Oh and this is my first post!