Which coder sessions would you like to see in Copenhagen?

To aid you in voting for your favourite sessions at Drupalcon Copenhagen and thereby help in the selection process, I decided to gather a topical list of sessions for the coder track. While we are in constant contact with some speakers and track chairs to define which track fits their session best (so you don't end up in a session purely discussing module configuration if you intended to see hard-core coding), the current list of coder sessions is already impressive.