I am coming over from Nike+, I can tell you that my Garmin device is far superior but the Nike+ online platform is far superior to Garmin.
I would really encourage the Garmin team to take a look at the Nike platform.
I'd love to see the shoe tracker on Garmin, on Nike you could enter your pairs of shoes and each run you did it asked you what shoes you wore and voila it keeps track of the mileage on all your shoes for you.
I would like to see this, on the splits page it gives you the difference from your last KM to the next (-/+ and % change)
Also the graphing and mapping is far better as well, after your run you see this I love the pace and elevation being on the same graph, also wherever your cursor is on your graph it shows a dot on the map of where that corresponds on your run. Your route is green, yellow and red for fastest, moderate, slowest paces.
Please think about making these changes, it would make alot of people happy.