You say it does not seems alive, but it is. We have this forum, a chatroom on Freenode, and a twitter.
There is no book yet, but there are plenty of fan sites like this one :
Toki pona is stil alive, last year jan Sonja has made new words, as you can see at the end of this page
Some other definitions were updated last year
If vous want to learn the langage there are lessons on the site of jan Pije
Some other sites have already tranlated them into other languages.
mi wile e ni: toki pona li pona tawa sina