About.com on Oracle: Provides feature articles, net links, lively forum discussions and a chat room.
DBAzine: Technical articles covering database management and administration, from a variety of authors.
Hotsos: Oracle tuning software, education, and consultancy services. Library with design and tuning articles.
ixora: Unix and Oracle, advice, scripts and training by Steve Adams.
Lazydba.com: Oracle DBA listserve. Archive of past discussions.
OraBlogs: Aggregated Weblogs for the Oracle development community.
Oracle Corporation: In addition to the famous database, Oracle supply a range of software to manage, share and protect data and information.
Oracle XE (Express Edition): Free to develop, deploy, and distribute.
OracleAssist.com: ITtoolbox's portal for Oracle assists Oracle professionals through discussion, an integrated directory, news, and other features.
Wikipedia: Overview and History of the Oracle Database.