ok Jean Valjean... these are the first ones that come to my head when *I* think of "leaving" poems, or Goodbye poems... they may or may not fit the description of what *you* are looking for... but at any rate, most are a good read... (i hope you dont mind that a few of them are my own)
Goodbye -- for her, by Me ... i wrote this when my best friend (and roommate)'s boyfriend left. How his leaving made ME feel.
Constant Inner Dialogue Prattle as I String a Candy Bracelet for Loupy, by Ashke ... Ashke is an old BLer who wrote this for her boyfriend, Loupy, also a BLer, when he was 2000 miles away. I always loved this piece.
Generic Advice to an Old Friend, by Me ... I wrote this for a good friend of mine when he moved from Boston to Colorado to be with someone, and found himself even more alone out there.
So, you're leaving... Goodbye..., by Me ... i wrote this about my boyfriend of a year and a half just this summer, when he went away for a few weeks with his job to another state. It's what kept me together while he was gone. *this one will probably hit home to you the hardest*
I never got to say goodbye, by Spencer ... I dont know who he wrote this about.. but i think it was for someone who had to be very far away from him.
the summer that should have never ended, by mellabopper ...if i remember correctly this is about friends leaving for college
the final hours (goodbye), by Shuddr2Think ...also written for a friend?/lover? that was leaving.
San Francisco -- by Alkaline Trio, posted by Spencer
Leaving Home, by C Divinity
Leaving Rockford, by PuristLove
All For Nothing, by Me ... i wrote this for a faraway friend, who i once took a 12-hour nightmarish trip to see, but never got to.
That's all i can find for now.