One Quickie

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Today's date as a string (NSString->General)

The general solution for converting a date to a string is NSDateFormatter. Sometimes you need to generate a date string in a particular format easily. For instance if you need "December 4, 2007", you can use:

[[NSDate date] descriptionWithCalendarFormat: @"%B %e, %Y" timeZone: nil locale: nil]

(Thanks to Mike Morton for this one)
(Also Mac OS X only)