My needs are simple. I'd like a record of how fast I was going over time. You may decide to show a set of that speed on screen as you showed us, but to have that stored and available after the ride would be nice.

Also a record of our altitude over time would be very helpfull since many of us will want to know how fast we've gotton going uphill. If you saw the last Tour then you know how important that is.

To have a summary screen that showed the changes in altitude over the duration of the ride overlaid with speed (say altitude in greeen and speed in red) would make such things easy to read.

Since I have no intention of mounting my n800 on my handlebars I really don't care too much about the interface but I would love to be able to see the aformentioned data when I'm done. Others of course will have different needs.