I have made a small GUI with which you can control arduino and perform tasks like analogReads,Digital Outputs etc..and several other tasks too. I made this with an idea to debug Circuits using Arduino. It helps a lot when you need to just study the behavior of a digital device..or sniff through the wiring of the circuit.
You can measure the AnalogValues on the analog Pins too..So,In case you want to check High/Low so, you will get the value as 0 (nearly) for LOW and 1023 for HIGH. similarly..you can measure the analog response of any other nature also..provided the 'Measured' qty stays less than +5V !
Edit: If you like the instructable..Plz Plz Plz do vote for the Contest! Its on the banner right above this Instructable..Hack It contest..
You do need .NET Framework to run the controlWare.You can download it from: Here!