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Apparently they are going to actually deliver soon. That would be a superb gift to publishers who feel a little left out compared to Adwords advertisers.
HOWEVER, there is a BIG but here.
I don't know the Analytics contact information, but for example, we share our analytics data with many members, naturally we wouldn't want them to have access to our adsense reports.
Can someone please notify either adsense or analytics that when they do this, they make sure that people who we give access to see reports, can only see statistical reports not adsense page reports from Google analytics.
If that's your situation, then I'd probably be looking to take out another separate Analytics account just for the AdSense data.
Choose "Add a Profile for an existing domain," select the domain, give the profile a name, set the time zone and hit the Finish button.
You'll be back at the Analytics Settings page where you can edit the settings of the profile you just made. What I'm guessing you want to do there is create a new filter for that profile which will include only the data that is collected from a specific subdirectory, for which there is a pre-configured setting. Alternatively, if you use subdomains or a more complicated URL structure, you may have to create a custom filter.
I don't know if there is a cap on the amount of profiles you can have, but, obviously, if you have a lot of members, it might be a very time-consuming process to set it all up. Then again, you won't have to change the tracking codes on their pages.