"Hacks" is used here in the older, more benevolent sense as some solution to a problem which is elegant and not obvious.
O'Reilly has a series of books of clever hacks for Linux, Mac OS X, Palm OS and even Microsoft Access. They're worth checking out, themselves. But by clicking the link above you will go to a page from which you can find many of these hacks listed. Check it out for fun or as a source of solutions.