Hi N.,
I use I Can Write by Discovery Toys. It's not a workbook, but rather a trace, practice, wipe-off system that can be used over & over again. Each letter of the alphabet has it's own wipe off card with the upper & lowercase letter, a picture of something that starts with the letter & a word that starts with the letter written in English, Spanish & French. My daughter is 4 1/2 & loves it! She thinks it's more of a game than "work" and has fun learning how to write her letters. I am a Discovery Toys consultant and can get you more information if you're interested.
Jan :)
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