Google has some fantastic and amazing potential for you to find whatever you want to find on the internet.  To search for a book / program / file then maybe try the following:

Go to Google’s search page and use the following criteria in the search dialog
intitle:index.of? file extension Name of item
e.g. intitle:index.of? chm syngress

This will give you a listing of all websites that google has cached that contain references to files in CHM format that are published by SYNGRESS.

Then in the Google,

+(”index of”) +(”/ebooks”|”/book”) +(chm|pdf|zip|rar) +syngress

or

allinurl: +(rar|chm|zip|pdf|tgz) Syngress

Enjoy