Again, I am new to mac stuff... so I started looking through macworld website and saw that their speedmark 5 test of the 2.4ghz imac was about 23% better then the 2.4ghz MBP.
Speedmark 5 tests:
iMac 2.8ghz extreme : 262
iMac 2.4ghz: 245
MBP 2.4ghz (15"): 199
MBP 2.5 (march 08): 222
http://www.macworld.com/article/61201/2007/11/speedmark5new.html
So it seems to me like the iMac is faster, overall, then the MBP.
Speedmark 5 tests:
iMac 2.8ghz extreme : 262
iMac 2.4ghz: 245
MBP 2.4ghz (15"): 199
MBP 2.5 (march 08): 222
http://www.macworld.com/article/61201/2007/11/speedmark5new.html
So it seems to me like the iMac is faster, overall, then the MBP.