Well, I completed my first functional program. It is severely limited, but it is able to successfully connect to and access data from a ThinkGear device.
ThinkGear Interface Test v0_1.zip
This program requires you to specify the COM port your ThinkGear is attached to, and assumes that it is at the default baud rate (9600). It seemed a good idea to ensure I could get the data, before I worried about scanning COM ports and baud rates.