Just bought the Forerunner 10 - couldn't ask for a better one. Love it. Went to Garmin Connect and was overwhelmed with the charts etc.
I am just wondering how do I change the pacer from hr/km to km/hr ?
If you look at the Stats tab below the graphs in an Activity Window you should see a minor heading "Timing" Below that heading are the options "Pace" and "Speed". Select speed and the data will change to the format you want (as will the graph above).
As you are a new user, you may not have noticed the "expander arrows" to the right of the graphs - once expanded, you can overlay the graphical data for an even more overwhelming view of your performance - have fun!