I am setting up experiments that involve phosphorylated and total ERK calculations.
I heard about colorimetric and chemiluminescent immunometric products that are available.
Can any one recommends a company with a product they have used?

The ERK ELISA kit from Active Motif, Inc is fine. Give a try.

active motif. It is good.

if you are interested in doing quantitative immunoblotting there are some good antibodies to regular and phospho-erk...i cannot remember now exactly who they were from since it was a while ago that i used them, but i am pretty sure that one of them was from santa cruz.

i know it's been a while since you posted this inquiry, but i just noticed today and ad on the back of the scientist for their cell signaling assays. if you buy one and use it and tell them the results they send another one free (though the issue is from 2/28 so the offer might not still be on). anyway, one of the listed kits is ELISA based total and phosphospecific erk.

sigma-aldrich.com/assaykits_ny3

Sigma does a great phospho-ERK1/2 antibody (WB 1:1000) always worked for me. Use with ECL+ reagents (Amersham) for quantitative western blotting if you have a STORM imager for scanning blots directly by chemifluorescent detection (image is saved directly and can be quantified using associated IMAGEQUANT software). Santa cruz ERK2 antibody is good for total ERK expression (WB 1:2000)

I regularly use immunoblot and quantitatively take IDV from the chemilimunisence developed hyperfilms or from Gel-doc software itself.
If you need any specific information check methods here:

Sharma SK, Bagnall MW, Sutton MA, Carew TJ.
Inhibition of calcineurin facilitates the induction of memory for sensitization in Aplysia: requirement of mitogen-activated protein kinase.Proc Natl Acad Sci U S A. 2003 Apr 15;100(8):4861-6. Epub 2003 Apr 2.