Excellent questions!
I'm sure I won't be able to remember them all, but I will try...
Math
Singapore Math - liked it, but wasn't a good fit at the time
Teaching Textbooks - like it and DragonGirl is still using it after a year
Math U See - liked it, but MonkeyBoy got too distracted with the blocks and just wanted to play with them
MEP for math - like it for MonkeyBoy and still using it
Social Studies / History
Story of the World - didn't care for it
History Odyssey - didn't care for it
Beautiful Feet Early American History - liked it
Science
R.E.A.L Science by Pandia Press - didn't care for it
Building Foundations of Scientific Understanding - liked it, but we decided to go the unit study route with science
Dr. Dave's Science - flipped thru it, didn't like it's approach to science, sold it
Language Arts
Michael Clay Thompson's Language Arts - liked it
Ordinary Parent's Guide to Teaching Reading - didn't care for it
First Language Lessons - like it and still use it
Growing With Grammar - like it and still use it
Writing Strands - like it and still use it
Explode the Code - wasn't a good fit for MonkeyBoy... too much writing for him
Plaid Phonics - didn't like it
Latin for Children Primer: A - liked it, but wasn't a good fit for DragonGirl
Song School Latin - like it and still use it
Latin Prep - like it and still use it
Handwriting Without Tears - like it and still use it with MonkeyBoy
Getty Dubay Italic Handwriting - like it and still use it with DragonGirl
Unit Studies
Five In a Row and Beyond Five in a Row - liked it
We recently started a unit study by Intellego and I reviewed our first week on my blog. I'll definitely be buying more of these! :)