Just read through this thread for the first time. As far as I'm concerned, the H/S palette in ACR4 is reason enough to upgrade. There is an excellent introduction to the changes in ACR4 here>
http://www.photoshopcafe.com/cs3/acr4.htm...which those who haven't yet downloaded the beta might like to read.
The writer's comment (in the paragraph headed 'The H Tab') that......
"....the HSL/Grayscale tab hides one of the most useful photographic innovations since the introduction of the RAW file! This tab allows us complete control over the color in our photographs."
......is not an understatement. There will be many occasions now when I will use CS3 simply for the Healing Brush and the Clone Stamp tool! ;-)
Allowing total pre-conversion, non-destructive colour correction is just fantastic. Add in the additional two channels in H/S (now eight to CS2/CS3/Lightroom's six) coupled with the nine point colour sampler and ACR4 is simply a must have for any colour geek.
I LOVE it!
D.
ps....Islandbuck, I too have never found Fors of any use. A one size fits all approach is just not on. I too use the Fraser method. But, unlike you, I correct every time I shoot in studio. Used to take me about 20 minutes between ACR3 and CS2 (the inadequate H/S in ACR3 meant that I had to finish the job in CS2). I then ran an Action to apply the results to all the other images. Now, in ACR4, I can do everything. Takes about 10 minutes. Wonderful!
In my opinion, default camera profiles are a waste of time. You will never, ever, capture a Gretag CC exactly the same way twice, even in studio. Much better to correct the capture of the CC each time, IMHO. That takes all the variables of different lighting (softboxes warmer than reflectors etc...) surroundings and casts from products etc..into account. Just my tuppence worth.
D.