While I agree with everything that has been posted here, I just want to mention one thing.
The myspace invite. I had a myspace account once for 20 minutes. (I think I created it to view some pictures from a doper) Anyway I get about 1 invite a month from Hot21yearold or her friend Ivanna Humpalot wanting to be my friend.
While is is likely the message came from PB, it is not a sure thing.
Send her Tucker’s address. 
This wasn’t a friend request (which is what I think you were getting). A Myspace invitation is when you do a search for someone on myspace and no results are found, you then get a message saying “so and so is not on myspace, do you want to invite them to join” – at that point, you must type in the person’s email address, click on the “invite” button and then, IIRC, click on a confirmation that you want to send the invitation. The email address to which the invitation was sent is not the one associated with my husband’s myspace account, it was the only email address he had given to PB. And yes, while there could be some possible way that someone else sent it – she admitted that she did. Or, rather – she claimed that she was helping someone else with their profile and the someone else “accidentally” clicked the invite. Again, I reference the several-step process involved in sending an invitation as well as the whole issue of the profile supposedly being for someone 5 minutes from us, but PB lives at least 3 hours from us. Wow, that’s a hell of a friend to drive 3 hours just to help set up a myspace profile!
As for sending her Tuckerfan’s address, no way – he lives just up the road from us – that would have her near us!! I don’t wanna have the crazy come to us.
Update on the sitch – Hubby emailed her last night. He stated unequivocably that he had sought answers and a mature friendship with her. He told her that he had asked her not to bring drama into our lives and the fact that she did was unacceptable. He referenced her hitting our myspace profiles repeatedly and messaging my friends (and me) and that that was psycho behaviour. He told her that setting up the “private” PO Box was completely unacceptable and that he had no desire whatsoever to send her anything in secret from her husband. When I say my husband is a sweet man, I mean it – he was very kind to her, but left no doubt that she was to never attempt to contact him, me or our children via any media. He had me block her on myspace from all of our profiles (since he cannot access myspace from a gov’t computer) and explained that I have known of the emails/messages/etc all along because I am his wife and we communicate. (I have mentioned on here a few times that my husband and I have a very close relationship – we are friends first, then lovers, then husband and wife – a lot of people don’t realise just how close we are.)
As of right now, I feel a sense of relief that is so nice. My husband also seems relieved. I know that he must have been hurt by this situation, because I know that he values friendship as much as I do and that he had been hoping to be able to be friends with this woman. I hurt for him – it’s not fair that he should have to completely discard her from his life, but it was a choice she made for him by trying to hurt him.
Thanks to everyone for the support. I have no reason to have to deal with this woman again unless she does try to contact one of us, at which point the police will be involved and an Order of Protection served against her. We have the documentation showing that she was told to never contact us again.
I’ve posted about this drama a little before. My best friend cheated on his wife with my girlfriend. I haven’t talked to him since finding out, but I totally rejoice in the fact that his life is miserable.
So he cheated on his wife. His wife knows because I told her. My ex-friend also works for his wife’s father, just another way in which his life sucks. I’ve been friends with him for a very long time and am on good terms with his in-laws.
I ran into them at the grocery store sometime close to ex-friend’s birthday. They asked why I didn’t make it to the party. It would have been SO EASY to destroy his life right then. I was SO TEMPTED to say “Oh, didn’t he tell you that he cheated on your daughter with my girlfriend? We’re not on speaking terms anymore.” It would have made his life terrible and I would have loved every second.
What I ended up saying was that I wasn’t aware of the party and he and I had drifted apart.
And ya know, it felt great to take the high road. I knew that I did something good for myself, I acted maturely and responsibly.
So there’s my advice. Act like an adult. Take the high road. Be a good influence on your children and do the right thing.
This is probably the best combo of OP and first response that I’ve read here, ever. High five, Jules. 
Glad to hear things working for you. You give great advice. Funny thing is, it’s not so much about “being the adult” or “taking the high road” as just “avoiding the drama” for me. I abhor drama, so for my husband to finish it (and finish it he did, I am so proud of him) and me not to have to do anything, well – that just makes me love him all the much more.