I was shocked and dismayed to see salesforce had furchased dimdim and killed it (of course). I was told that my account would be active until 3/11/11. Whatever. I had been using join.me for some time now.
Jane wrote about this today and her list fails to mention join.me which I find to be an easy and outstanding service.
I use this for face-to-face class meetings! I have students in the classroom that I give the link to so that they can better see the screen. The projectors at my school are top of the line, but cannot adequately display a 1440X900 resolution so that a students 20 feet away can see my code. Their physical machine can easily. Also they can screenshot or record from their local machine if they want (and they do!).
I say get join.me. I might even pay for an account I use it so much.
Jane – add join.me to the TOP of your list. Most of the other services you have alphabetically listed are worthless.