I bought this book before its predecessor, but that didn't matter at all. It's basically a quality collection of street art pics, with some accompanying quirky blurb in places (some of which is entertainingly worth reading, some less so).
As street art books go, it's up there with the good'uns, but my main criticism is that I would have liked whatever artist/location info was available to appear alongside the photos on the pages, rather than just a small Picture Credit/Attributed Artists paragraph at the end of the book. Of course info is limited when you are talking about photos of street art contributed by numerous people, but still I'd have liked whatever sketchy info was available to be there with the photos.
I picked up Untitled II at the Banksy Bristol Museum show in August. It's a wonderful companion to vol 1 and seems to carry on chronologically where Untitled left off.
It's a real mash up of street work and includes a feature on Dolk and Pobel putting up some amazing work in an abandoned fishing village in Norway. There's also a whole section given over to Banksy and Swoon hitting up Nola. The book is part critique and part laugh a minute which makes for an interesting read but the books real strength is that it features such a stunning breadth of work from around the world. It just goes to show that creativity on the streets is still very much alive and kicking. It's worth buying for the Nola work on it's own.
There is a great collection of witty and beautiful graffitis in this book, accompanied by interesting short reads, outlining the reality of the urban bonding behind graffiti artists. So pleasant and interesting, if anyone is interested in graffitis or has read Wall and Piece, this is a great book to read.