What are the important meta tags to use?

Google states that the following meta tags are used during their indexing and search results:

Black Hat SEO

You get what you pay for...

Recently a client decided to opt for a cheap offshore SEO firm promising to increase their site traffic from under 3,000 visitors per day to 30,000 within a couple of months.  "If we bring traffic to you, you'll sell more product"  But, their target demographic is very specific with only 250 thousand people worldwide for their service.  Their management is basing success on hits, not sales.

Seems odd and short sighted.

This brings to mind all the black hat SEO companies out there.

Here are a few posts from a black hat SEO forum:

What Google Says About SEO Firms

This is taken directly from:

While SEOs can provide clients with valuable services, some unethical SEOs have given the industry a black eye through their overly aggressive marketing efforts and their attempts to manipulate search engine results in unfair ways. Practices that violate our guidelines may result in a negative adjustment of your site's presence in Google, or even the removal of your site from our index. Here are some things to consider:

Be wary of SEO firms and web consultants or agencies that send you email out of the blue.

Amazingly, we get these spam emails too:

How Bing Ranks Your Website

This is directly from Bing - about their ranking method

Bing website ranking is completely automated. The Bing ranking algorithm analyzes factors such as webpage content, the number and quality of websites that link to your webpages, and the relevance of your website’s content to keywords. The algorithm is complex and is never human-mediated. You can't pay to boost your website’s relevance ranking. However, Bing does offer advertising options for website owners.