Here is a list of great printable kanji practice sheets! On all of these sites, the kanji are divided by grade level. Master the First Grade (一年生) kanji, then go to the next level. Please leave a comment if you know of any other great websites or resources for learning kanji.
1. Happy Lilac
Happy Lilac also has other great printables for elementary-aged children HERE.
2. 子育て、ことば育て (Kotoba.littlestar.jp)
(This website might be by the same people who made the Happy Lilac website… they look very similar)
3. Jakka.jp
4. Nekopy.com
This website doesn’t have printables, but has great interactive games for reviewing kanji
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Hiragana Mama 
These look great! I really must try them out 🙂
Thank you for all the helpful websites!
Hi – thank you for the good recommendations. What I am searching for is a web-site or iPhone/iPad app which allows me to GENERATE MY OWN KANJI REVIEW/TESTS FOR CHILDREN. I find the order in which the kanji are learned is different in every different resource (Kumon, Shimajiro, Japanese Gov’t children’s textbooks, etc.) I would like to find a way to choose, say, the twenty kanji my daughter is struggling with, and then hit a button and “bang” a dedicated test is generated by the app which tests the reading/writing etc. of those exact twenty kanji. Basically, most Kanji test and review systems (including those helpfully included above) assume the child has completed the whole year, and then will go back and review en masse, with kanji randomly. The better way to learn is to review constantly throughout the year. Appreciate your help.