I love it. It gets shortlisted on occasion. :D I thought it was kind of gross and middle-aged until I started watching The Office and fell in love with Pam, who is ADORABLE.
I don't really like the nn Pam though, ironically. Someone (I think it was jeziana) suggested Mel to me and I really like that. Dunno if that's your style though. I actually have a character in a story who is Pamela nn Mel (in the story, it's to distinguish her from her aunt who is Pamela nn Pam, not that her aunt is really in the story much).