Company's rarely change the name of a well liked product. Consider a 1976 Honda accord vs a 2010 Honda accord. They are vary different cars targeting different markets but as long as people think product X = quality the name tends to stick around.
No, that's the Power Mac. The PowerBook predates the PowerPC by years--the first PowerBook was in 1991, and the first PowerPC-based PowerBook was in 1995, while the first Power Mac was in 1994.
That makes absolutely no sense--the "Power Macintosh" wasn't unveiled until the PowerPC chips were actually shipping, because the brand denoted the presence of the new processor. Why would you name a computer brand after a processor it doesn't have? It's like calling a 386-based 486-era laptop a "Penta" because you anticipate that future versions of it years in the future will have Pentium processors.
