And I have to say, I've quite enjoyed the experience. E17 is a very well put together desktop environment. Things I love:

1. The amount of control you get over your windows (it can optionally remember which virtual desktop, size, postition, etc. you want an application in, as well as conveniently being able to start it at login and/or pin it to the desktop). Very nice, as Borat would say.
2. Low resource usage for nice bling - and not so much bling as polish really. Try it and you'll see what I mean. It's a good looking desktop, no doubt.
   
3. I like middle click on the desktop and you get a list of open windows. Switching to other windows is remarkably easy after a while.

Things I prefer about Gnome:

1. Transparency with compiz/beryl
2. Expose like feature of compiz/beryl
3. Integration of Gnome apps such as rhythmbox, etc. E17 still doesn't have a systray - I use trayer to get around it, but it's not ideal. It's a blight on an otherwise great desktop for E17.
4. Avant Window Navigator. Cover album integration is too nice.
   

I have to say, at this stage I'm not sure whether I'm going to stick with E17 or Gnome. Stay tuned....

Unfortunately it seems to move as slowly as rocks, and so I'm still unable to easily install it without going the whole hog and installing from eLiveCD . Do I have the guts to do this? I doubt it. Next week we'll see...

Update: scratch that. The edevelop ubuntu repos seem to be working nicely. I'm running e17 and loving it!