This should be easy/built-in, but I'm looking for a way to right-click on a file and send it by email... I know I can drag to the Mail app but right-clicking and selecting from the context menu puts less miles on my mouse.
If you want something more specific (or several somethings more specific), you could also very easily build contextual items using automator and add them to the menu... You could add several items to your contextual menu that create messages with the files in different ways...