So I'm using MAMP PRO, to have a better vhost utility. Ok. I've got serious problems with wordpress.
I successfully done this:
pointed a vhost reghellin.unbit.it to: /Users/stratboy2/Documents/01-LAVORI/perbacco/XHTML/SITO-PERBACCO/
Installed wp 3.3.1 multisite here: /Users/stratboy2/Documents/01-LAVORI/perbacco/XHTML/SITO-PERBACCO/giboperbacco
setted up another vhost www.giboperbacco.com to: /Users/stratboy2/Documents/01-LAVORI/perbacco/XHTML/test_multisite
installed there a normal (for now..) fresh version of wp.
Can't really install it. Every time I go to www.giboperbacco.com, I get redirected to test.unbit.it/giboperbacco
1 IMPORTAT NOTE: this issue happens only with wordpress. If I substitute wp's index.php under [path]/test_multisite with another index.html or even another .php with no wordpress code, the vhost WORKS FINE.
So I guess it's not really a vhost problem, maybe some kind of wp problem.
2 IMPORTANT NOTE
I also tried to create and point some more vhosts to [path]/test_multisite, but all keep redirecting to test.unbit.it/giboperbacco