Unity is a great piece of software. But unfortunately, some people who are not accustomed to Unity, or even Linux in general, may have some trouble when running Ubuntu for the first time. The help guide installed on Ubuntu is very helpful, as are sites such as ubuntu.com/tour and ubuntu.com/ubuntu/features . But, how will a user know to open the dash and search "help" if they don't know about the dash. Granted, most users will eventually figure out Ubuntu in two to three days, but it would be very helpful if there is a warm welcome screen on the first login, either showing the information from the Ubuntu desktop guide, or a different, more user friendly guide. Something like a video, or an informative yet easy to understand small help section with the basics of unity, from the the launcher and appmenu to the notification area and filtering results in the dash. I believe Linux Mint twelve does this, and as should Ubuntu. Preferably in time for 12.04, with it being an LTS and all.
This tour could also be the perfect place to get the user started with the online features of Ubuntu.
The experience could begin with a "Hello <user>. Are you familiar with Ubuntu? If not, you can take a quick tour". After the tour, Ubuntu should invite the user to create a free Ubuntu One/Ubuntu SSO account and get started at syncing applications on the Ubuntu Software Center, documents etc.
If the user clicks "No" for the guide, Ubuntu should ask the user to enter his Ubuntu One/Ubuntu SSO info and start syncronizing his/her previously installed apps and downloading Ubuntu One files.
Additionally, these things could also be asked during an Ubuntu's fresh installation for the main user, in case he's already familiar with Ubuntu and, if the user wants it, download his apps while installing, so that when he logs in for the first time, most things are already set up.