One of my absolute favorite pinball games was actually the first of its kind.
"Black Hole" by Gotllieb... http://www.ipdb.org/machine.cgi?id=307
it feature the a multi-level playfield where the lower playfield, which was UNDER to main playfield, actually slopped AWAY from you so the flippers were in the back... crazy! The table came out back in the early 80s and had some of the coolest styling at the time. I poured more quarters into that table than any other, and have been searching high and low for a table to purchase and repair. (its one of the most sought after machines, of course. Figures.)
"Baby Pac-Man" was another interesting one, which combined a traditional Pac-Man video game with a pinball table. http://www.ipdb.org/machine.cgi?id=125
If you manuvered Baby Pac-Man out of the maze you would end up below in the pinball game. It was novel, but the game play really wasnt that great. I did hope others would try a similar concept but I dont believe anyone did. It could work well in a 360 setting though.
I know this idea has been put out there, but it would be awesome if ZEN (or someone) would recreate actual tables from the past and release them for the 360. The more legendary the table (read: expensive to license), the more expensive the cost. And by expensive, I'm not saying 1000, but like 300.