IDC connectors don't play nicely with breadboards. The 2 rows of pins are too closely spaced and there are many hacks to get around this issue. In one of our tutorials we recommend taking a IDC connector with right angle leads and bending the leads to make it fit. This does work, but is a pain to get right and it looks ugly.
The 10 Pin IDC to Breadboard Cable fixes all that. It has a standard 2x5 pin IDC female connector at one end and the other end plugs straight into your breadboard. It doesn't get much simpler than that.