I had a 22" samsung 226bw + dell 24" 2407wfp alongside each other on the same desk for a month or so. My thoughts on this are...
*The size difference is quite a lot but 22" is still pretty big
*I found both screen's native res's fine for that size of screen and if anything the extra res was a hinderence as lower fps at native resolution etc
*The dell 24" makes me wanna puke on first person shooters

*Yet the dell has far more "wow factor"
*Samsung 22" was extremely livable with until i saw the dell which generally day to day is a lot nicer for browsing etc.
*The 22" screens are still great value for money imo, especially the 226bw or similar.
*If i hadnt seen a dell 24" i'd be more than happy with the far cheaper 22" screens
*If your even remotely into first person shooters and you need an LCD, it has to be a 226bw.
*dell 2407wfp is v good for browsing!
Hope this helps!