I had heard about the "click here" thing, and I guess that would be good for those sites who don't do SEO and haven't found ways of replacing it (and similar phrases) with something else to make a relevant anchor, and in those cases where it just makes plain sense to use something like "buy now".

I'd be quite pleased about the sitewide links, because from what I've been able to check, a number of my competitors have different domains that all link to each other in this way. I only have two sites and they do link to each other but not sitewide.