Is there any debugger for IE like firbug?
You can’t get better than that. I didn’t find any problem not solvable by that panel. Develop sites primarily in Chrome or Firefox… then debug a little with that IE panel.
Learn good code practice via w3c
I just realized that any thread from Themeforest or any other marktplace can be seen on Codecanyon just by changing the url host and vice versa.