There are many cloaking techniques, including IP based, User Agent based, and doorway pages. IP based cloaking detects the IP of a visitor, and if it’s a search engine spider, redirects it to an optimized, but not user-friendly page. User Agent based cloaking accomplishes the same thing, except that it differentiates between visitors according to the software they use to reach the site, since robots use their specific settings. Doorway pages are somewhat different. They are basically keyword-stuffed for search engines, but when a visitor reaches the page, it either redirects them immediately to another page, or requires them to click a link to “enter the site.” Keep away from cloaking, unless you want to be banned after a week of getting to the top.

Declare the character encoding you use in the META "Content-Type" tag of every page. However, from then on you’ll have to follow the character set you’ve chosen. Failing to do so may damage your ranking since the page will be considered technically flawed.

If you’re using cascading style sheets (CSS) or JavaScript, move them from your actual page to an external file, and embed them through a SRC link. Search engine spiders are rumored to place a slight penalty when the textual amount of scripts is bigger than the amount of actual “crawlable” content.