mutiple domians
 

if you have a second and point to your site wich is already in the google, will google consider that spamming, and will it do you any good to ad a second domain?

If you redirect it you're fine. If you alias it you'll have duplicate content for which you'll get banned. Good luck.

I'm not too clear on the question - is the second domain a mirror site of the first? Google won't like that, but simply linking from one domain to another shouldn't cause any problems.

ok - i'm guessing hes asking about havening one server and two names pointing towards that domaine.
I'm having the same question. have on name but is changing. was told that i shouldt keep the old name so I couldt still get that traffic .. does SE blacklist me for that ?

Just redirect it and you'll be fine.