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the color isn't as bright and sharp as I remember it
CRT monitor brightness and color accuracy change with age. Recalibrating the monitor on a regular basis can extend its useful life, but at some point it will become impossible to mitigate the aging process.
I recall reading somewhere that a CRT that is used daily has a useful life of around three years as far as color-correction pros are concerned...
I think that it is possible to calibrate a portable Mac screen so that it will be accurate enough, particularly after you have used it for a short period of time. You can create a monitor profile that will compensate for the enhanced colors and saturation and switch to it when working with digital photos. Calibrate it next to your Apple Cinema Display and get the MacBook image to look as close as possible to the ACD. If you are going to be using it primarily in the field and will be saving critical work for your home/work Mac, I think that even a glossy-screen MacBook will do nicely for you.