There is a nice new thread at Search Engine Watch Forums named SEO Top 5 money investments. The member asks, "which you consider the top five SEO techniques for money investment?"
The first few responses accurately reply that it is almost impossible to say on a generic level, without seeing the site in hand. But if you had to give a general answer, what would you say?
Chris Boggs suggests that you should invest in the following five areas; (1) site structure, (2) content, (3) link building, (4) usability and finally (5) longevity. Well said. RCJordan (a SEM forum legend) writes that he always spends his time and money with "content management" (he can mean the framework or the content development or both). He then recommends buying some "near-bleeding-edge hardware" (trying to decode him), which may mean some black art magic. And finally he recommends, that folks spend money on traveling and attending search conferences.
Forum discussion at Search Engine Watch Forums.