Selecting text by using simple mouse clicks

Double clicking a word – will select that word.
Triple clicking a word – will select the whole paragraph surrounding the word.

Clicking on the left margin, can be even more useful:

A single click on the left margin will select the whole row.
A double click on the left margin will select the whole paragraph (as in triple clicking a word).
A triple click on the left margin – will select the whole document.

Cancelling the selection is simply achieved by a single click inside the text.