If you go to
www.pacific-cycles.com and click carryme you get this:
As far as I know there isn't a 2009 edition yet (Pacific hasn't even delivered half of the bikes in their 2008 catalog yet).
I'm not sure where you can find 2007 Carryme specs at this point, but here are the differences I noticed on the bikes I've tried:
-on 2007 the finish of the headset is matt, on 2008 the finish of the headset is brushed
-on 2007 the detachable pieces of the handlebar are connected with an elastic cord, on 2008 they're connected with a piece of rubber
-on 2007 the clamp securing the headset uses a quick release lever, on 2008 it uses a fiddly brompton-like latch
-on 2007 the free wheel is in the front bottom bracket, on 2008 the freewheel is in the rear hub
-on 2007 the gearing is 90/16, on 2008 the gearing is 86/14
-on 2007 the fold places the front wheel sideways through the chain loop, on 2008 it folds pointing forwards
-on 2008 the front fork has a hook/latch to hold the steering in place relative to the frame while the bike is folded
-2008 has holes for a water bottle mount
-2008 has holes for a front rack
-2008 may have fenders and front rack included (at least all the ones I've seen have them mounted even though the specs say they are optional).
-2008 is advertised being 2 pounds heavier than 2007. I'm not sure where the difference comes from because my 2007 bike is pretty much as advertised at 7kg. (i'd actually like to find out what happened here because those extra 2 pounds sound like a big disadvantage to me)
-2008 bikes seem to be available in
fewer colors.
Pics on the web seem to show that there are some other subtle variations out there, but as best as I can tell there are just these two kinds floating around the US.
Maybe madfolder (Ken) from alternativevehicles can tell us more.