Java

Decimal Formatting:

http://docs.oracle.com/javase/tutorial/i18n/format/decimalFormat.html

Visual Basic

 http://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.100).aspx (Most Important)
 http://msdn.microsoft.com/en-us/library/system.string.format(v=vs.100).aspx (Quickest Read)
 http://msdn.microsoft.com/en-us/library/26etazsy(v=vs.100).aspx (The Whole System, Long)