Came across this article at DailySEOblog.com by Mani Karthik, it is one good list put together in terms of what is true and what is not in the SEO world.

People have their own theories on what works and what doesn’t. While some things are never revealed officially by search giants, SEOs figureout by practice. This is one such list you should have a look before you start optimizing your website.  I don’t have second opinions on any of the points listed by Mani.

Quoting a few points from Mani’s list of 25:

3. Changing the crawl rate settings in Webmasters tools console will change the Google crawl rate once and for all.
Apparently not. Google will also check your posting/publishing frequency and set an appropriate crawling frequency based on it, despite your manual setting.
10. A flash page means bad SEO.
Not at all. Using flash will definitely give you less options for SEO compared to a content rich page, but that doesn’t mean bad SEO. You can focus on other SEO factors and get equally good if not better results.
11. Adding a WordPress blog will automatically fix your site’s SEO.
WordPress is a great tool. But just adding one to your site/replacing with it will not give you any edge. You have to use it wisely to get the results.
14. Sitelinks appear only for websites who have high PR.
Sitelinks are auto generated for websites with high traffic. There is nothing you can do control them except to block some of the links from appearing using WebMaster tools
22. SEO is a one month process. Do it and get it done !
SEO is not a quick fix. It requires regular check ups and updates. Nothing can be achieved in short term.

Read the full article here: Top 25 commonly believed SEO myths.