What I think about those PageRank-display-services, which provide you with a small button that you can plaster your homepage with which shows your current PageRank, has been made clear often enough. However, today I stumbled upon a site in a blog-comment which dwarfs everything I have seen up to this point as far as number and variety of buttons are concerned (Caution, the picture will get quite large when it is enlarged):
A truly epic accomplishment that this young man has achieved there.