I might well have mentioned this one before, but as I'm highlighting checklists at the moment, it would be remiss of me not to mention The Best Damn Web Marketing Checklist, Period! on Search Engine Guide. If you have the time to go through this entire list and ensure that your website ticks all the boxes, you're very lucky indeed. I'd love to say that every website I'd designed met all these criteria, but it wouldn't be true, and indeed, there probably isn't a website in the world which has. But we can at least try.