Summary
	any	Any type of variable.
	array	An indexed array of variables
	binary	Binary data
	boolean	Yes/No, 1/0, true/false
	date	Anything that ColdFusion can convert to a date.
	guid	A guid or UUID of the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	numeric	Anything that ColdFusion can convert to a number
	query	A ColdFusion recordset
	string	A string
	struct	A ColdFusion structure
	uuid	A ColdFusion UUID of the form xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxx
	variablename	A string formatted according to ColdFusion variable naming conventions.
	void	This is used to specify that no value is returned from a function.

View more information on the ColdFusion data types at the Macromedia livedocs website http://livedocs.macromedia.com