It'd be nice if, when uploading cycling activities, the upload also contained the name of the bike.
The fact that the computers themselves (the 500 and 800 at least) allow multiple bikes to be configured is a great feature in that many cyclists own more than one bike. Seems to me to be a logical extension that when I subsequently view the activity in Garmin Connect I can see what bike I was riding in order to produce that data.
My (sensible) winter bike weights 50% more than my (fast) summer bike and this weight difference (not to mention the faster geometry etc.) does affect my times. Just be nice if I could see that when I view historic activities.