AdSense and Multiple Analytics accounts
I have one AdSense account (the forced limit) and three Analytics accounts (work, personal, and Dabr). Can I link them up how I want to? No.
The AdSense account is used to show ads down the side of this site, which I thought was an interesting idea to see what kind of money it can pull in. It’s not much, about £1.67 in 40 days. It has highlighted something annoying to me though.
Google lets you link up your Analytics account to your AdSense account so you can get some fairly interesting statistics like those shown in the screenshot on the right. I like it a lot as I’m a big fan of Analytics and what it can do. Unfortunately, they’ve made the next part a little frustrating: you can only link one of your Analytics accounts to AdSense (remember I have three).
So what if I want to show AdSense stats on another account? I can’t. You’re not even allowed to set up a second AdSense account because the sign up form specifically tells you not to (and makes you tick a box to agree to that). To add even more frustration, unlinking your Analytics and AdSense accounts is a manual process and you need to visit Google’s How do I unlink my AdSense account from Google Analytics? page to contact their team to do it for you.
All that for some stats? Thankfully my other experience with both products has been rather smooth – for now at least! In a few days the Dabr account will go over the 5M pageviews/month limit for free accounts and I may need to sign up to AdWords to keep that working. Fun fun.

I have exactly the same problem. Since there are over 160 websites & blogs in my network I needed to create at least 4 different accounts. (Remember the 50 profiles limit for an account). I think Google should allow connecting one Adsense account to multiple accounts since it is very frustrating for many. I have a temporary solution by piling together the most money making websites in one account, but surely it is not a professional way for experienced website network owners.