I'm in the market for a new MBP and was comparing the Macworld reviews (here) for the 2.4 GHz and 2.66 GHz 13" MBP. The reviews claim that the $300 price increase is hard to justify for the bump of processing power and HDD of the 2.66 GHz machine. However when I look at the benchmark comparisons the 2.66 GHz does look like it made some gains over the 2.4 GHz, specifically the speedmark is 8 points higher than the 2.4 GHz and some tasks (Mathemetica-Mark 7 and Parallels WorldBench 6 for example) showing good improvements. There is also a comment section (here) in which people are being nudged toward the 2.4 GHz MBP for the same reasons as above. So I was just curious if anyone out there has had any experience with either of these machines or has any opinions on the subject. /*Additional information about my case... I'm going into my 3rd year of a physics degree, so price is fairly important to me. I would use the MBP for (besides everyday stuff) programming, numerical calculations and simulations (the odd game of HL2 to relax would be nice but it's not a dealbreaker). Portability is not that important as I don't bring my laptop to class. I don't do a lot of work with media so I thought the 15" MBP would be a bit overkill. I'm not opposed to the 15" MBP but it's price makes it a stretch but would pay-off if it lasted and proved to be more useful over it's lifetime. I was hoping for something that would be alive and current for 4-6 years (and be able to handle what I threw at it) and would carry me into a grad degree. Edit: my current machine is the early 2008 MB 2.1 GHz C2D w/ 1GB and a combodrive (booo)*/ Thanks!