basically there are 2 types of components in this world...through-hole or surface mount.
through-hole units are you normal leaded resistors and 5mm LEDs and the like, they have a pin or row of pins (leads) that need to go through a circuit board to be soldered (although they don't absolutely have to, but that's how they are designed) and generally soldered on the opposite side. breadboards are designed to use through-hole components to prototype a circuit before you build it, they are easy to use and require no soldering and are great for prototyping.
surface mount devices (SMD) are components are those that are designed to mount on the top of circuit boards with no hole drilling neccessary unless you need to pass a trace between layers of the circuit board. they are slightly harder to solder (unless you get the really tiny ones, they come in some _very_ small sizes, or the really big ones (which are easier to solder IMHO)) and are generally half the size or smaller than their through-hole conterparts so you can pack them closer together.
the ZLT+ board is a good example of an SM circuit board. most electronics made before 1985 (i'm taking a guess here) are good examples of through-hole circuit boards =).
since the every day use of computer assistance that can simulate a running circuit is common place now, i would doubt that there are many companies out there still using breadboards to prototype stuff. i would think most folks just put it all into spice or electronic workbench or whatever and flip the virtual switch to test it out.