I recommend I’d Know You Anywhere, which I read for the TLC Book Tour, but you should also go back to the Baltimore Blues and become acquainted with feisty Tess Monaghan. Here is a fun link to a Washington Post interview that my friend KC Summers did with Laura several years ago, exploring Baltimore. I also liked this link from Laura's website which describes some of Laura’s favorite children’s books (I love Edward Eager too and am glad my college remembers him with an annual creative writing prize). Laura usually mentions a kidlit favorite in her books, and here it is the Oz books.
Laura also wrote the introduction to the new 2-in-1 edition of Heaven to Betsy-Betsy in Spite of Herself. If you are an adult who has never read Betsy-Tacy, this is where you should start. Late breaking news: congratulations to Laura - I'd Know You Anywhere debuts at #16 on the 8/27/10 New York Times list.