Hi Davninia,
Thank you for touching one of my main concerns - I didn't really mention this, but I was very worried about the risk of diluting my other well-ranking keywords.
I am happy to report that w have invested countless hours in tailoring each of our product pages to be unique. While they do contain common keywords and phrases the majority of their descriptions are quite unique.
3. I'm glad to hear this - it was actually one of the first strategies we employed (and basically at the root of my question about pages competing against each other.)
4. Great idea.
6. We've been doing that for a few months now. It can get quite expensive when there's no nearby organic link, but a sale for us is one that the competition doesn't get.
Your last suggestion is really interested - I didn't realize that was something that could be done. I'll be using that regularly from here on in I'm sure. Thanks!