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 hopefully give you a listing of all websites that google has cached that contain references to files in CHM format that are published by SYNGRESS.
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for searching ebooks
+("index of") +("/ebooks"|"/book") +(chm|pdf|zip|rar) +syngress
or
allinurl: +(rar|chm|zip|pdf|tgz) Syngress
