> 
> Hi 
> 
> 
> Could you please recommend me a book on Ruby which covers the basics 
such as
> MultiThreading, CGI, GUI, Command line interface etc..other than what is
> given in the PDF document........
> 
> Thanks and regds
> Suresh
> 

As of this minute, the only book in English is "Programming Ruby: the 
Pragmatic Programmer's Guide", by David Thomas and Andrew Hunt.  You can 
read an HTML version at http://www.rubycentral.com/book/, though I highly 
recommend buyng the book.  O'Reilly will be releasing  "Ruby in a 
Nutshell", by Yukihiro Matsumoto ("Matz"), creator of the language, any 
day now.  There are a few other Ruby books expected to be published by the 
end of this year, or ealy next year.