I love having someone I can ask stupid questions without feeling totally ridiculous. I'm extremely fortunate to have Hilary on my team -- we do almost the same job, she has previously returned from leave so understands my experience and she's a great mentor. Hilary is acting as my "peer mentor" for my transition back. No one has assigned us as such, but it's pretty obvious. She's the person I'll call each day with questions about why something happened, who I need to talk to about an issue and general guidance about our day-to-day jobs. Of course my manager will also be there for support, but I don't expect him to make the time for me that she can. Plus, she knows more about what we do each day, since she actually does it. :-)
Some best practices I've found in this role and others:
Have you had a peer mentoring relationship? I'm sure I've missed some key tips... Do you have any best practices to add?