liquid laundry soap recipes

Here is a recipe that I found online. I made it this weekend and it worked well on the first load of laundry. I wonder how washing soda would affect/improve the performance, or if it is necessary. I also wonder what other purposes I could use this formulation for (e.g. body wash, shampoo, facial cleanser). What additives have other people used?

Coconut oil (76 degree): 8 ounces (226.7 grams) (25%)

Palm kernel oil: 8 ounces (226.8 grams) (25%)

Lard: 16 ounces (276 grams) (50%)

Distilled water (for lye): 25.6 ounces (725.7 grams)

Lye—potassium hydroxide: 8.1 ounces (230.7 grams)

Distilled water : 64 ounces (1,814.4 grams) (for dilution and borax)

Borax: 2.5 ounces (70.9 grams)

Fragrance oil (if desired): 1.5 to 3 ounces (42.5 to 85.0 grams) per pound of finished soap (This is added after the cook and dilution.)

http://idiotsguides.com/static/quickguides/hobbiescrafts/make_your_own_household_and_laundry_soap.html