Saw that Little Willow recommended Babymouse: Monster Mash as one of her Best Books of October 2008.
Also, Linda over at "In Linda's Library" recommended the Babymouse series as a great "First Chapter Book:"
One of the most exciting times in any one's life (and equally fun to observe over and over) is when the ability to read takes hold and the wonderful world of literature suddenly opens itself. Ever since Dr. Seuss wrote The Cat in the Hat there have been special books just for those readers who are just beginning to be able to read to themselves. There are increasing numbers of really good stories that fall into this category. Older readers still look for these books and remember them with great fondness. I read new ones eagerly and laugh at the jokes as hard as I would have over fifty years ago when I was just learning to read....
Babymouse series by Jennifer L. Holm and Jennifer Holm is a favorite with girls (and a few boys brave enough to overlook the ever-present pink) who are just learning to read and those who are confident readers who continue appreciate the humor, some of which is quite sophisticated on many levels. The graphic format means that it is easy to grasp what is going on whatever ones reading level. The stories are full of humor and everyday experiences.