You can use a rhyming system of mnemonics by Lewis Carroll, author of the immortal "Alice" books and much nonsense poetry, to remember dates, phone numbers, and other numeric data.
Concrete ideas to modify and expand this hack go here.
Freeform discussion of this hack goes here.
Errata go here.
This is a page for a hack from the book MindPerformanceHacks by Ron Hale-Evans.