For those who use MS office and particularly Excel and do a lot of graphing/charting (science applications), Excel 2004 was the last good version. MS office 2008 (universal binary), had lots of problems on Intel macs and crashed a lot. However, they made some major changes to how Excel works in 2008, in particular limited what can be plotted when fitting data, and how plots are made. Office 2011 was no improvement in terms of Excel, though Word now seems to run without crashing as it did in Office 2008. You can run Office 2004 in an Intell Mac, but only if running Snow Leopard, and even then Word will crash once in a while depending on what you are doing. However, I never have any of these issues running Office 2004 on a PPC mac.