Dave Chenault led a thread on it last summer: read it here. A few posts down he talks about the minor trimmings he did, and notes they didn't add up to very much. IIRC, this was THE post that substantively discussed that Jam model.
After heartily defending it in that thread, though, he later posted a write-up of a nearly complete MYOG makeover he gave it. Here's that thread.
This is a total aside, but I'm personally starting to wonder about chopping off the whole back pocket. I like my 2010 Jam for its ability to carry snowshoes so dog-gone well (I love the wrap-around ability of the compression straps, probably my favorite feature of the Jam and what (in my mind) gives it a place in my gear closet next to my CDT), but that back pocket just seems extraneous. it's obnoxious to access, and you can't see anything in there to make it any easier. It could be I'm a lousy packer, but I've come to prefer mesh in back. Chopping off that pocket would give me a big tubular pack with good side pockets and nice hip-belt pockets, and a flatter surface to put my snowshoes against.