When I was preparing my first change set, I was a bit surprised that I couldn’t get information about what was changed recently. Then I learned that there is Audit Trail which stores this kind of information as a changelog.
So I prepared a tool where you can upload a CSV file (from View Audit Trail section) and it will show you the changes made in the system (changed Apex classes, VF pages, objects, fields, profiles etc.).
This is useful for migration using both change sets and by ANT.
Feel free to use it: Salesforce Audit Trail Parser
Short instruction is available at Help section