Right now I (and many people I know) have different login credentials
for different Google products:

1) Google Adsense
2) Google Adwords
3) Google Analtyics, Gmail, Calendar, Talk

I'd like to merge those accounts. If that's not possible, I'd like to
be able to switch between these products, without having to log in
again.

*Adsense Exits*

Adsense offers the possibility to track clicks with channels. This is
nice for general reports, but I'd also like to see how many people left
a specific page, clicking on Adsense.

*Combined reports*

I would like to be able to mix Adsense and Analytics data and create a
single report that I can mail to my clients. I have clients that run
both Adsense and Adwords, for multiple sites or multiple sections of a
site. Combining the data I can say:

"This week you have spent XX on Adwords. This resulted in XX sold
products and XX submitted contact forms. The orders are totalling XX
euro. The forum section of your site brought you XX euro with Google
Adsense and 14% of the sales."

I can do this by requesting .CSV files for each product, but right now
I can't automate this. Please make an API or something.