2 SEO Quick Tips - spam - cloaking

spamming:

No more spam. If you think the google does not see your spamming techniques, think again - they see it and with penalize you for it. Web Masters - you are sealing your sites fate with spamming.

cloaking:

Cloaking as defined is a process of providing search engine crawlers pages different than what a browser would see looking at your site. This is not a good idea and you can be penalized for it.

Some cloaking methods are okay according to google, specifically if you are adjusting your URLs to make them more accessible by spiders and not just forcing content their way.