I'd say:
1.) For the most part it's bad.
2.) Have you actually tried typing your screen name into google? Try it and see. If you've been using the same screen name for 6 months or more, I bet that there will be something.
3.) Personally, I really like my screen name; I did not get any ideas for it anywhere, I just wanted a unique name, and so I thought of one.
4.) Iv'e been thinking along the same lines of this topic for some time now (this is why I have so much to say), and I would say that it would be safe to have a screen name that you want to keep for general, everyday (eg normal, non-blackhat) activities.
However, consider having a different name for blackhatting. It can be something that you can remember easily, too. For me, real names are sometimes easier to remember than traditional 'screen names'. Use what works for you.
5.) There's probably not a whole lot you can do about having your name, screenname, or other information appearing on google in some way you'd rather not have it associated. So, simply refer to step 4, and to put added security to this technique, change your blackhat name every once in a while. That way, it's a lot harder for someone to get a straight trail of information about you.
I've spent some time just finding out as much information on a particular screen name as possible. You can always tell the individual has had a screen name for a long while when you can not
only get their email, myspace acc info, phone number, and address, but you can also confirm the information by cross-referencing from different sources.
6.) I suppose, in conclusion, all I'm trying to say is, if someone is annoyed at you, and wants information, they will get it. But, you can make the job a lot harder for them by using 'disposable' screen names.
Those are my thoughts
