I found an interesting little tool Website Grader which evaluates your website. It produces a score and a list of things you can do to improve it. Some of the things I don’t agree with, but most are pretty good. Last night I played with it and the best sites I looked at were 80-70/100 and the poor ones were below 20/100.
At first I thought the comments on meta-data were bogus, but it is explained better in the blog article Understanding The Magic Of Meta-Data. It points out that although search engines don’t use them exclusively, most SEO experts do recommend that websites use meta-tags. The Meta Description Tag may influence the description of your page. The Meta Keywords Tag is useful for synonyms and less common words. These tags can work in conjunction with your website text.
Also see an earlier post Philipp Lenssen’s Tips For Crafting a Linkable Blog Post.