Tigger is my other longtime ghost-friend. Unlike Jenny, she and I didn't have any serious unresolved business at the time of her death, so she tends to haunt me a lot less. She does show up every now and then and comment that something is really fucked up and she's sorry I have to deal with it, which is helpful.
There's more about her on the HypertWiki. I expect I'll be doing some writing about our adventures together, too ("let's pretend we're horses and go to the hardware store!").