Oracle

About.com on Oracle
Provides feature articles, net links, lively forum discussions and a chat room.
http://databases.about.com/od/oracle/Oracle_Databases.htm

ixora
Unix and Oracle, advice, scripts and training by Steve Adams.
http://www.ixora.com.au/

Oracle: TimesTen In-Memory Database
Database stored in physical RAM for applications requiring high speed throughput. Includes product datasheets and case studies.
http://www.oracle.com/database/timesten.html

Oracle XE (Express Edition)
Free to develop, deploy, and distribute.
http://www.oracle.com/technology/products/database/xe/index.html

Wikipedia: Oracle Database
Encyclopedia article providing an overview and history of the company's database product.
http://en.wikipedia.org/wiki/Oracle_database