Heya Angus. Just a quick note on the keyword density issue. I wouldn't go so far as to say it's crap. It's just not what everyone thinks it is. It's still a useful metric, but only to help you ensure your target keyword phrases are used more often than any other phrases. But it's crazy to focus on it too much. If your copy is actually helpful, it'll naturally have a whole lot of words that Google recognises as related. These count in your favour too.
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Note, if you want an insight into how meaningless specific keyword density percentages are, check out: http://www.e-marketing-news.co.uk/Mar05/garcia.....
Cheers.
I might save that article for a rainy day ;)