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Datatypes in red are new to VB.Net 2005.

CLR Name	VB Name	Bytes	Range
System.Byte	Byte	1	0 to 255.
System.SByte	SByte	1	-128 to 127.
System.Int16	Short	2	-32,768 to 32,767.
System.Int32	Integer	4	-2,147,483,648 to 2,147,483,647.
System.Int64	Long	8	-9,233,372,036,854,775,808 to 9,233,372,036,854,775,807.
System.UInt16	UShort	2	0 to 65,535.
System.UInt32	UInteger	4	0 to 4,294,967,295.
System.UInt64	ULong	8	0 to 18,446,744,073,709,551,616.
System.Single	Single	4	-3.4028235E+38 to 3.4028235E+38 Approximately 7 significant digits.
System.Double	Double	8	-1.79769313486231570E+308 to 1.79769313486231570E+308 Approximately 15 significant digits.
System.Object	Object	4	Contains a 32 bit address.
System.Char	Char	2	Any Unicode character.
System.String	String	4	Contains a 32 bit address. The length of a String object ranges from 0 to 2,147,483,647 Unicode characters.
System.Decimal	Decimal	16	128 bit integers scaled by 10e, where 0 <= e <= 28*.
System.Boolean	Boolean	2	True  or   False.

^*The largest absolute value of a decimal number is 79,228,162,514,264,337,593,543,950,335.
  The smallest nonzero absolute value of a decimal number is 0.0000000000000000000000000001.