I have a page like that, but it's hard to say how useful it's been, since I only have one published book, and am getting ready to release the second, though there's blurbs for several others in the final stages of preparation. I have a hard time imagining it not helping, once the books are released, and I can include links to the amazon page for them.
I'll also say, whenever I get a traditionally published book, that page is one of the first things I look for. I can usually tell whether I'll like an author, stylistically, from the blurbs, and I'll often put books back if it looks like the author has a swing-and-a-miss track record of holding my attention.