These books will likely continue to be useful:

Games for Reading by Peggy Kaye

Italic Handwriting

Family Math for Young Children by Jean Kerr Stenmark

Miquon Math with Cuisenaire blocks

Mathematical Reasoning by Critical Thinking Press

Mathematics Made Meaningful with Cuisenaire rods

Games for Math by Peggy Kaye

Calc-U-Draw by Buki

Mind Benders by Critical Thinking Press

I have never found a language arts book I really liked but we did use

Learning Language Arts through Literature by Debbie Strayer for a few years.

Megawords workbooks for spelling

These are some of the new books we began to use in 2nd grade:

Developing Critical Thinking Skills through Science Book 1 by June Main and published by Critical Thinking Press

Big Book of Books by Dinah Zike

Usborne books on any subject!

Bill Nye the Science Guy

Games for Writing by Peggy Kaye

Tangrams and Patternables

DIME blocks and workbooks

Magic School Bus

Come Look with Me series by Gladys Blizzard et. al.

Music Ace software

The Way Things Work book and software

Kingfisher’s Batteries & Bulbs and others in series