I got into some interesting conversations with people at work.

Metric for "cross pollination across your products"

Google struggles to get average users to cross pollinate from the main product (search) - to the other products (mail). Yahoo! also has a plethora of separate sites - what is each companies transfer rate from one product to the others. Yahoo! views each of its sites as a advertising portal and tries very hard to get people to cross pollinate to products like answers.yahoo.com
Mining user data

When are users ok with it and when are they not? To me as a techi, I am ok with google reading my email because I know that its not someone personally doing this - its a machine and an algorithm - but can understand why someone who is not technical has a problem with this. I think everyone is ok with amazon.com 's book suggestions - which are based on which books you have viewed and purchased. People get very angry is their user data is shared to others - for example the facebook beaconing outcry.

Management hierarchy
What is the correct shape of a management hierarchy and how many product people do you need compared to engineers. Years ago I called this the companies P:E ratio - For example in Yahoo! Australian office at that time, there where 70 product people and only 7 engineers. a 7:1 PE ratio

Never keep a project secret

If you project is being kept a secret from anyone at work - that is a really good sign that there is something wrong with it.