CURRENT SITUATION
The Italian version is under the root folder, while the English version is under a folder called /en/.
Google seems to spider only the italian version, while the English version seems to be skipped (maybe because it's not under the main folder?)

MY SOLUTION
I was planning to create a second domain pointing to the homepage of my current site. Based on the url the user/google is coming from, I'll show him the default.asp in the root folder or the default.asp in the /en/ folder.

Do you think this is the best solution? Or is a better way to have google spider the /en/ folder?