That 50-booties book is fabulous. Also...I got a great book for my birthday called "Style Your Own Kid Knits." Each chapter is for a different age range, and it has basic patterns for like 4 or 5 different kinds of sweaters, with all sorts of instructions on how to customize the patterns. There's a glossary of stitch patterns, etc -- a veeeeery cool book that will serve me for years to come.
And of course my old stand-by is Melanie Falick's "Knitting for Baby." Love it. Erika Knight's "Knitting for Two" has some beautiful things in it...and I really like "The Yarn Girls' Guide to Kid Knits" too. (Can you tell I do a lot of knitting for my kids?)
Debbie Bliss patterns are so adorable, but they do run big. Either that or my mom doesn't swatch, because she's been making DB sweaters for us for years and they are always too big.
The only thing I don't like about the patterns themselves is that they (at least the ones I have paged through) don't have drawings of what the finished pieces should look like -- you know, those little line drawings with dimensions and stuff? (I really like those.)
And of course there's the FT kids' clog pattern!