Green Wall Resources

All this talk about green walls has made it painfully evident to me that I do *not* know my houseplants well enough.  The only book I even have about houseplants is a copy of Taylor's Guide to Houseplants with a 1987 copyright on it. It's a handy book, but not as comprehensive as I'd like.

A brief browse through Amazon and a few resources seemed to be best-reviewed. What about you, dear reader?  Do you have any indoor plant book recommendations?

I'd love readers' suggestions on good books for houseplants.  More on what I actually *do* know when it comes to indoor plants next week.