In the Drupal 7 web site I am developing, I have a requirement that will not allow a user to login from multiple computers or different browser (IE and FireFox) on the same computer. It looks like the Session limit module used to handle this, but I don't see where it is even under development for Drupal 7. Do you have any idea?
If you look into the modules issue queue, you would see that there is already a very active port underway. You could help to get it to a solid release by testing it out.