To add to the great comment above, especially for the parents here considering instructing their children on the formalities of reading, make sure your children learn the sound-symbol correspondences of English (or whatever language's) writing system and skills for pronouncing unfamiliar words first seen in print. All four of my children, now avid readers, got a lot of help from the book Let's Read: A Linguistic Approach by Leonard Bloomfield and Clarence Barnhart.
A good book for developing reading skill and getting kids hooked on reading (it has worked for all four of my children) is Let's Read: A Linguistic Approach.
http://www.amazon.com/Lets-Linguistic-Approach-Leonard-Bloom...
I like the stories in that book, too, especially the very last story.
Interpreting that as a request to name the textbooks I find useful, I'll do that here.
Elementary mathematics:
Primary Mathematics
http://www.singaporemath.com/Primary_Math_s/21.htm
and
Miquon Math
http://www.keypress.com/x6252.xml
Secondary mathematics:
The Gelfand Correspondence Program series
http://www.amazon.com/Algebra-I-M-Gelfand/dp/0817636773
http://www.amazon.com/Functions-Graphs-Dover-Books-Mathemati...
http://www.amazon.com/Method-Coordinates-I-M-Gelfand/dp/0817...
http://www.amazon.com/Trigonometry-I-M-Gelfand/dp/0817639144...
http://www.amazon.com/Sequences-Combinations-Limits-Library-...
and
Basic Mathematics by Serge Lang
http://www.amazon.com/Basic-Mathematics-Serge-Lang/dp/038796...
and
The Art of Problem Solving expanded series
http://www.artofproblemsolving.com/Books/AoPS_B_Texts_FAQ.ph...
When a student has those materials well in hand, it is time to work on AMC and Olympiad style problem solving,
http://www.artofproblemsolving.com/Books/AoPS_B_CP_AMC.php
http://www.artofproblemsolving.com/Books/AoPS_B_CP_Olympiad....
and also the best calculus textbooks, such as those by Spivak or Apostol.
http://www.amazon.com/Calculus-Michael-Spivak/dp/0914098918/
http://www.amazon.com/Calculus-Vol-One-Variable-Introduction...
http://www.amazon.com/Calculus-Vol-Multi-Variable-Algebra-Ap...
Elementary reading:
By far the best initial reading text is
Let's Read: A Linguistic Approach
http://www.amazon.com/Lets-Linguistic-Approach-Leonard-Bloom...
but there are many other good reading series, including
Primary Phonics
http://www.epsbooks.com/dynamic/catalog/series.asp?seriesonl...
and
Teach Your Child to Read in Ten Minutes a Day
(I devote more time than that to reading instruction, typically, because I use multiple materials)
http://www.amazon.com/Teach-Your-Child-Read-Minutes/dp/14120...
and quite a few others. There is more junk than good stuff among elementary reading materials, alas.
http://www.amazon.com/Lets-Linguistic-Approach-Leonard-Bloom...