9. Alt and title tags
Using the alt and title tags for your images can also prove helpful, especially for images you can click on, as these tags will act just like the anchor text on a regular link.

10. H1, bold, italic and strong tags
Highly controversial, it seems that these tags still keep a little amount of importance, although alot less in the past, because they have been heavily spammed. Don't use them too much, or you might trigger a spam filter.

11. Page depth
In short, don't expect a webpage buried deep inside your site to rank well. Still, it isn't impossible it that page gets alot of inbound links or links from your most important internal pages.

12. Webpage language
Choosing the right website language can prove useful for regional searches, as your website may get a boost if the search is being made from a regional search engine ( example : google.jp ) or from an IP address in the same region.

13. Rate of content change
Some web pages rank well just by not changing for a long time, which shows they offer strong information, and others update their content very frequently and still manage to rank well. My advice is don't edit your pages just for the sake of fooling the search engines. If you do edit your pages, do it for your visitors.

14. Webpage size
Webpage size ( both in KB and in the number of words ) is not a very important factor, but you can notice that, for the highly competitive keywords, only websites with a considerable amount of content about that subject manage to rank well.

15. W3C validation
Although it is highly unlikely that a crawler checks if your website is W3C valid, validation is useful because you give the spider information about the char set you use, so it can interpret your page correctly. And, if it's a standard nowadays, why not go with it ?

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