Tried to reply to the title post but was unable due to it being antiquated. So, adding my 2 cents with a new post:
I too would like very much to have a useable debugger with the Arduino products. I have just migrated from PicAxe and note that even that platform has one. I also find "debugging by Serial.print" to be cumbersome and annoying.
Anyhow, I have downloaded the Arduino Pro IDE but was disappointed to find its debug capability does not include the Arduino Uno (which is all I have now). I did note however from the previous post that the Arduino Zero is supported in some capacity at least. I have tried looking around for further info but have not been very successful, at least in finding something that an amateur might be able to make use of. BTW, the Zero is listed on Amazon as being not available with no indication if it will be in future - I don't know if that means anything in particular as to the future of that item.
In any case, could anyone kindly direct me to a good source of information on how well the Zero debug works and how best to set it up (and something a non-expert could understand)? Or maybe other alternatives?
TIA for any assistance....