This question maybe a better fit on The Business of Software forum but despite my post on there, I'm still unable to determine the following: Can I use the Google API to build commercial software? If not how can the people behind Byline charge for their app?
Update: I'm specifically interested in Google's Picasa & Reader APIs
From the Google Terms of Service:
(emphasis added)
More specifically, when you say "the Google API", which of the many APIs Google exposes are you referring to? Each of them has different terms of use. Some can be used commercially, some can't.
Update:
from the terms for the Picasa Button and Uploader APIs
from the terms for the Picasa Web Albums Data API
As far as the Google Reader API is concerned, it still appears to be unreleased and so no specific terms are available.
To enter into a signed agreement with Google, you're probably best off contacting your local Google office and talking to one of their business development representatives there... Alternatively, you could try contacting the Business Proposals department from their contact page...
Which API do you want to use? I think that Google Maps API has some limitations. You should read the term of use carefully and make sure that it fits what you want to do.
Update: The Picassa API can be used in a commercial app but you can not charge the user for a separate fee. see 5.8 at http://code.google.com/intl/fr/apis/picasaweb/terms.html
If you are talking about the Google Web Toolkit:
http://code.google.com/webtoolkit/doc/1.6/FAQ_GettingStarted.html#Can_I_use_GWT_to_develop_commercial/enterprise_applications?
The answer is Yes.