I also got to look at the First Time series. These books are larger, and made out of a tough card stock material. So they're a bit different from the board books, but still plenty sturdy. What I enjoyed about these books was the text. It's not your typical "first you do _____ and then _____ happens..." etc. Instead, they're written in a conversational style: "I like your bed. Can I sleep on the top bunk? Say hello, Rabbit! Say help, Dolly!" (from First Time Sleepover).
My favorite was Snug by Carl Thompson. It's a sweet, sweet book that talks of all things snuggly. The cover is a bit misleading. I thought the illustrations and text inside were much more whimsical than what the cover leads you to believe. Again, the teacher brain in me is always going and I kept thinking how fun this would be on pajama day when the kids are all snuggly and get to bring in their stuffed animals!