Tip Of The Day (1) : Screenshot

ScreenShots

Don't forget to read the other tips:

Tip Of The Day (5) : Batch Script to resize pictures in linux (Nemo)

Tip Of The Day (4) : Bulk renaming files in linux

Tip Of The Day (3) : Linux Mint 13 and Petra Backports

Tip Of The Day (2) : Batch resizing pictures in linux

On Gnome, and gnome based environments, Screenshots are taken by gnome-screenshot package

 there's a well made article about this here, so i'm not going to explain it that much

the only tip here is to start the app instead of taking the screenshot at a key strike, use : 

gnome-screenshot --interactive

and assign it to the dedicated key (Impr)

now, instead of having a screenshot taken instantly, the dialog box is displayed and give you some choices ;)