As I’ve edited my thesis, and used a variety of Mac OS X the bizarreness of the Home / End keys in OS X has driven me mad. In some apps they go to the top and bottom of the document, in others to the beginning and end of paragraphs, and in other apps (e.g. Ecto) they didn’t work at all!
Today I tracked this down, made the changes, re-logged in and, wow, they work how I want (beginning and end of line respectively). That man deserves a DB.