This is one of the first, if not the first, art book from Imaginary Friends Studios. It was published in 2005 and now the book is in its second edition with a different cover art. Imaginary Friends Studios is based in Singapore and I happen to meet some of the artists who work there - they are always at the comic cons in Singapore.
Imagine Prime is a 246 page paperback that features art from 47 artists. It collects 500 pieces of commercial and personal art. There are concept art, fan tributes, comics, advertising work, etc. The quality of work is high although sometimes you can still detect slight rawness from some artists. The highlight of the book is probably Artgerm's art which are really beautiful and just stands out from others.
Overall, it's a nice art book, and inspiration for hopeful artists. Most of the Imaginary Friends artists are on deviantart, you can check out their work there.