Family Fun | Mrs. Piggle-Wiggle

It's been awhile since I did a post on a kid book but with summer approaching, I've been trying to find some good books to take with us when we go overseas.  We've recently discovered Mrs. Piggle-Wiggle.  These were written in the '50s and remain a timeless classic.  She lives in an upside-down house, smells like cookies, has magic in her hump, and can cure any ailment.  In the vein of Pippi Longstocking - it will be a fun read.  I'm still looking for some good books to take with us.  What are some of your favorite reads for 4 and 8 year olds?  Also, what are your thoughts on letting kids us kindle or ipad to read?