Best explained with an example:
Say I want to know how to make cheese, so I go to the Crafting Compendium. I have no idea how cheese is made, so I search All Recipes for Cheese. I can find the recipe easily, but the only way to determine the trade skill used is to press the Back arrow to look at the Category, then Trade Skill. This is unintuitive.
I propose putting the Trade Skill just above the Check DC on the recipe pages. For recipes with multiple trades that can craft them, perhaps a link to the other skill's recipe, e.g. Carpentry Hardening Finish (ID 1010) would have a link to Herbalism Hardening Finish (ID 1011).