hi friends !!!! i have downloaded lots of ebooks from   www.ebookshare.net.  but all of them has appeared with a  "  .chm  "   extension. plz tell me what application should i use to read those books ???

See this:
http://en.wikipedia.org/wiki/Microsoft_Com...racting_to_HTML

only after you read:
http://filext.com/detaillist.php?extdetail=CHM
and
http://en.wikipedia.org/wiki/Microsoft_Compressed_HTML_Help

Although it's Microsoft's, it's portable on Unix and Mac

Hi,there are many computer ebooks free download.
 
free ebook download
 
such as:c++,csharp,adobe,ajax,asp.net,head-first,java,linux,my sql,oracle,perl,ruby,rails,python,acess,visual basic

this is an old topic BTW.

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I'd also recommend you another resource with many useful ebooks - http://www.ebook-search-queen.com/ . Personally I have found it not long ago and use ever since! Good luck!