Has it happened that you need to select some text from a link? It can be a very delicate procedure: you have to carefully look for the end or the beginning of the link, click just next to either of them and then drag until the wanted text is selected. Then you paste it somewhere and remove the unneeded words.
Asa Dotzler brings up an alternative hidden method: press the Alt key while making a selection over the link just like it was regular text.
He has also suggested to improve it mimicking Opera’s behavior that autodetects whether you are trying to drag the link somewhere or making a selection based on the direction of your movement. Of course this doesn’t solve the discoverability problem completely but would be a step forward.
Edit: Due to an ugly bug when you Alt select text within a link it will also save the link to your default location. This is a conflict with another modifier: Alt + click on a link and the target will be saved automatically.