Incredibly useful macro's that I use in all my xCode projects!

Examples

General
isPad (iPhone or iPad?)
iOS6 (iOS6 or higher?)
isPortrait (portrait or landscape?)
docFolder (the documents folder)
tempFolder (the temp folder)

Conversions
convertToLbs(kg)
radians(degrees)

Day/Week/Month/Year
kMinuteInSeconds
kWeekInSeconds

Shared instances
NOTIFICATION_CENTER
FILE_MANAGER
MAIN_BUNDLE

What else?
Debug logs
Log all fonts with 1 word
Suppress warnings
Show alertviews with showM(@"Message");
A lot more!