<p>I'm looking to add a numeric up / down control to a .Net StatusStrip.  Unfortunately, it isn't listed as an option in the UI designer.  Is there a way to do this? </p>

You can use a
ToolStripControlHost
class to host a custom ( NumericUpDown for now ) class.
You can also derive from this class "NumericUpDownToolStripItem" which initialize the "Control" property with the custom control and can populate next properties from the hosted control ( Min, Max, Value - for example ).