Great idea but 37signals' list is too long. It discourages you from actually reading the whole list.
If you cut some of the latter and reform the rest into more general questions I think it could be really effective. (e.g. "Can I see a list of all the CEOs I know in San Francisco?", "Can I see a list of everyone I know in the 312 area code?" >> "Can I view groups of clients by contact info?" "Can I view lists of contacts with stacked filters")
[edit:] Alternatively, you could make the list predominantly use cases.
Doesn't it look like a definition list then though.
* changing the "Yes" to "Yes you can:"
* turning all the "Can I"'s to bullet points
* removing the question marks.
See also: http://www.marco.org/380868888