There's a good white paper from Oracle called "Oracle Database 10g Product Family" and dated Jan. 2004. It was given to me by the Oracle instructor when I took the "Oracle 10g: new features for administrators" to make sure we respect the Oracle licensing. I could not find it online. It explains all the options and all the management packs. It also has a nice table of features and availability. It list the features/options, if they are available in the standard edition and/or the enterprise edition and which ones require an extra cost.