One common requirements we have in our day to day Siebel Activities is the Siebel Bookshelf. Its the ultimate knowledge power house regarding Siebel.
Below are the links you need for different Siebel Versions:
Siebel 8.1.x http://download.oracle.com/docs/cd/E14004_01/homepage.htm
Siebel 8.0.x http://download.oracle.com/docs/cd/B40099_02/homepage.htm
Siebel 7.8.x http://download.oracle.com/docs/cd/B31104_02/homepage.htm
Siebel 7.7.x http://download.oracle.com/docs/cd/E05553_01/homepage.htm
Siebel 7.5.x http://download.oracle.com/docs/cd/E05554_01/homepage.htm
Siebel 7.x http://download.oracle.com/docs/cd/E05555_01/homepage.htm
Siebel 7.x Mid-market Edition: http://download.oracle.com/docs/cd/E05565_01/homepage.htm
Siebel 6.x http://download.oracle.com/docs/cd/E05556_01/homepage.htm
Siebel Online Help Files and Help Development Kits
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