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@Andy Whitcroft: I don't agree with your conclusion.
I've applied a swappiness reduction (from 60 to 10, and sometimes even from 60 to 1) on a whole range of various computers. Some 30 or 40 computers in total.
On *all* of those machines I saw a noticeable performance increase. On some machines, with 512 MB RAM or less, the performance increase was even spectacular.
It appears form my own, rather extensive, practical experience, that a swappiness of 10 is a good default for desktops. On 512 MB RAM or less, a swappiness of 1 is even better. This is confirmed by numerous reports on the Dutch Ubuntu forum, of which I'm an active member.