I am looking for supplementary BOOKS and materials (although web sites and other recommendations would also be welcome) to bring more INTERESTING grammar practice into a few of my younger classes. Titles / Authors / Publisher information as well as why you would recommend it would be most welcome. Advance thanks.

I'm a speech-language pathologist who works in Taiwan, so probably greater than 80% of my students are ESL as well as having language learning deficits in both Mandarin and English. The sources I use most are:

www.superduperinc.com
www.linguisystems.com

For specific books and games, some of the best are:

http://www.superduperinc.com/B_Pages/bk309.htm
http://www.superduperinc.com/F-G_Pages/gb347.htm
http://www.superduperinc.com/F-G_Pages/gb61.htm
http://www.superduperinc.com/B_Pages/bk298.htm
http://www.superduperinc.com/WXYZ_Pages/wcm4010.htm
http://www.superduperinc.com/F-G_Pages/GB167.htm

http://www.linguisystems.com/itemdetail.php?id=480
http://www.linguisystems.com/itemdetail.php?id=280
http://www.linguisystems.com/itemdetail.php?id=271
http://www.linguisystems.com/itemdetail.php?id=523
http://www.linguisystems.com/itemdetail.php?id=113

I only included links for younger kids, but these companies have resources for all ages through high school. Both have fabulous catalogs, so you might want to request those. Best wishes to you!