If you spent your new year's eve downloading the Siebel installers from edelivery.oracle.com and plan to use the integrated Haley rules engine, you might run into an issue described in this My Oracle Support (formerly known as metalink3) article:
New Installations of Siebel 8.0 and Siebel 8.1.1 will not contain Haley Rules for a short period. (Doc ID 758818.1) (Note: You need a My Oracle Support account to access the document)
The article points out that any installation media acquired on or after Dec, 29th 2008 does not contain the installers for Haley Authority.
Furthermore, the article refers to the end of march 2009 where we can expect a patch which will upgrade to Haley Expert Rules version 5.2.
Oracle acquired RuleBurst Australia, which purchased Haley Systems earlier in October 2008.
Have a nice day