Fritzing is an open-source initiative that allows you to virtually design electronic circuits on a breadboard (although you could design circuits that aren't on a breadboard). This could save a lot of hours working on a breadboard if you have this amazing software at hand. In this new version of Fritzing a high-level summary of changes are:

• Snap to grid (experimental, switch it on in the View menu);
• Use arrow keys to move parts around (hold Shift to move by ten steps);
• Improved rats nest coloring (less obtrusive, and more reliable dimming if a net has been routed);
• Replaced zoom widget by a nice slider;
• Now fits on netbook screens as well (side-effect of the above);
• New parts: RGBB LED, LCD screen, slider pot, small rotary knob pot, Arduino pico and more mystery parts;
• Dutch translation;
• Bug fixes.

But if you're interested in the detailed changes, take a look at the individual code changes clicking here.