Companies To Write To

Emailing companies is an excellent way to get a bunch of coupons for items you use!
The Best Master list I've found thus far is here!
Here's a list of companies I've gotten coupons/samples from.
Samples:
Jelly Belly Jelly Beans - Are going to send me a few sample bags :)
Red Vines - Got 3 bags of their licorice
Bigelow Tea- 4 Tea bags Plus Coupons

Coupons:
riceselect
Purina
Edy's
Heinz
Barber Foods
Gerber
Gillete
Dominos Sugar
Johnsonville Sausage
Ziploc
Starkist 
Odwalla 
Kettle Brand Potato Chips 
Sarah Lee Deli Meat
Argo
Apple and Eve
Sunkist Citrus
 Herr's Potato Chips
Boboli
Bar-S  
Seapak/Rich's 
Nivea
Cotonelle/Kimberly Clark
Ragu/Unilever
Whiskas
White Castle 
Domino Sugar


This will continue to be updated. But this should get you started!