I had a 1920x1200 WUXGA 15.4" screen on my previous laptop. It was amazing for my photo editing but it was pretty annoying for spreadsheets, documents, web browsing.. pretty much anything other than photo editing. Even though you can use text zoom functions in Word and Firefox, websites sometimes didn't look right (on Firefox) and it was kind of frustrating to have to keep adjusting zoom levels in Excel, Word, etc.
On my new laptop, I chose to get 1440x900 WXGA+ on a 14.1" screen and I am perfectly happy.
I thought 1280x800 WXGA on a 15.4" made everything look way too huge and the 1920x1200 WUXGA on a 15.4" made everything way too small, but I didn't have any way of telling how WXGA or WXGA+ would look on a 14.1" that didn't require me going to a store to check different screens out. Then I came across this:
Notebook LCD Display Comparison
The table lists different pixel densities of different screen/resolution combos. This really helped me choose what resolution was best for me without physically seeing all the screens in front of me.
I knew that WUXGA on a 15.4" was too high of a resolution for me (147 ppi)
I knew that WXGA on a 15.4" was too low for me (98 ppi)
I was trying to decide what 14.1" screen to get: WXGA (107.1 ppi) or WXGA+ (120.4 ppi)
The WXGA on the 14.1" was only ~10 ppi greater than on the 15.4", but the WXGA+ on the 14.1" was almost exactly in between the WXGA and the WUXGA on the 15.4" screens, so I figured the WXGA+ on the 14.1" would be perfect. I was right!