Preferences
You can find the Skitch preferences either by pressing the History
button and then choosing the Preferences Tab, or by selecting the
Preferences menu item from the Toolbox menu, or under Skitch > Preferences in the menu bar.

Most of the settings are self-explanatory, but here are some things you may not understand:
- Brush Fitting Precision - This
lets you adjust how much 'smoothing' is applied to your brush stroke by
Skitch. If you are using a drawing tablet with Skitch, you will want
'precise', if your mouse-drawing tends to be jerky then you will want
to use 'loose'
- Show Skitch window in fullscreen and crosshairs Snap — If you want to take a snapshot of Skitch itself, check this box. You can also hold down Option when you click on Snap to get the same result
- Skitch fullscreen Snap hotkey and Skitch crosshairs Snap hotkey
- By using a hotkey, you can take a Snap with Skitch while still
in another application. TIP: This is handy if you want to take a picture
of a part of an application
that disappears when you switch to Skitch. For example,
palettes in Photoshop™, disappears when Photoshop™ is not the
frontmost application
Tip:
You can always just double click an empty part of the frame if you want Skitch to minimize in the normal fashion