[itslennysfault]

There are still companies making new pinball machines today. The mechanical parts are pretty similar to what they've always been. Energize a copper coil, make a piece of metal move. However, the "brains" have come a long way and are basically just modern computers. Also, everything is far more modular. Old pinball machines were a rats nest of wires. Modern pinball machines just use standard computer cables / connectors.

[schlauerfox]

For reference: Stern is nearly the whole market, but there is Jersey Jack and Spooky Pinball, and a handful of smaller players in the market. There is an incredible private community over on pinside.com if you want a community of real people to chat about these machines.