Only a short one today, but vitally important.

Do make sure that any and every link you have on your website opens in a new window!

Such a small thing, but often overlooked.  If you add a link and it opens in the window you’re currently in all you’re doing is directing your traffic AWAY from you and elsewhere.  By opening in a new window, you do at least keep your web visitors on your page whilst adding further offerings for them!