I am considering starting a website with a partner. Revenues will be purely ad related.
Is it ok to use two different Adsense IDs on the same website/webpages? I mean:
would that comply with the Adsense ToS? (I just went quickly through them and could not see anything against having two different Adsense IDs... but I might have missed it).
And does anyone have experience with this kind of setup?
What is a point of using two adsense IDs? You can create different ads, even if they are the same size, and track the performance of those ads.
It may not compete with their TOS, but it isn't a very good idea. Google puts a lot of time into their algorithms (to make more money for you and them), and they probably didn't account for scenarios like that.
If this guy's your partner, you should set-up a joint bank account (or just start a company) and split things from there. This certainly won't be the only "how do we split" questions to come up.
I think I found the answer to my question here in the Adsense FAQ:
https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=32855 (emphasis mine)
If a website is in compliance with our
program policies and the company or
owner of the site has given you
permission to display ads on their
site, you may place your ad code along
with the other publisher's ad code on
the same page. You will, however, need
to contact your web hosting company or
the owner of the website to obtain
permission to display ads on their
website.
Please keep in mind that a maximum of
three regular ad units and one link
unit may be placed on one webpage. In
addition, please be aware that every
publisher is responsible for the
content of a website on which their ad
code is placed. If a website is found
in violation of our program policies,
we will notify any publisher(s) whose
ad code is on the website, and ask you
to remove the Google code from that
page.