I have a small amount of sites that I would like to link together more as some have quite decent PR but the problem is that they are all in wildly different markets. I have one that's a pet site that has low PR and one that's a myspace site with higher PR and one site that sells household stuff (lower PR) and one that is about broadband (higher PR). Poles apart market wise and relevancy wise. How is the best way around this? I doubt a direct link between would do much good as they are not in any stretch of the imagination (I know I tried stretching my imagination that far!) related sites. Any ideas? Jez.
Because of relevancy, I would not link between them. You might, however, try to find someone with a similar situation that you can trade links with. I.e. Your pet site links to his pet related site ...his social site links to your myspace site. But no reciprical linking. ...that or sell links on your site so you can use the cash to buy links on related sites sites.
I'd put a link in anyway. It won't do you any harm unless you look like a link farm and it will probably do you a small amount of good, even if it's only someone who likes one site going to see what the other has to offer.
Link them will help you more or less. Relevancy is a factor, but doesn't mean unrelated will not help your PR. Statcounter has links to all the kinds of websites, and about 90% of them are unrelated with statcounter, but it is still PR10.