I have just started playing around with MSAF and I noticed that startup logging is missing labels. After some testing I found this to be the correct mappings when using AnalyticsEvent directly.
The reason I noticed this was because I was seeing the following sequence: WP7, Started, <no data>. I opened up the assemblies in .NET Reflector and while looking at WebAnalyticsService.Started() it was using ObjectType and not ObjectName.
I would log this is a bug but since I just learned about the framework today I feel I am not in a position to do so until I learn more about it. =)