“Undocumented Express” Tips by William G. Brown

It's only now available (so I believe) through a Google cached copy, but William G. Brown's "Undocumented Express" paper contains a number of good Oracle Express tips in nine categories:

• MCALC
• Worksheets
• Time dimensions
• TCONVERT
• Capstones
• XCA
• Faster SQL-based loaders
• Custom functions
• Conjoints

 Check it out whilst it's still available...