If one has certain set of keywords then tools like WT & Overture can also be used to arrive at other relevant seed keywords.

Typically seed keywords are single word. A good number of seed Keywords is between 10-12.

SUB theme Keywords (add Qualifiers)

Now to these seed keywords add qualifiers.

These qualifiers can be anything location/sub-product/color/part no/activity/singular etc.

By utilizing these qualifiers one can expand list of seed keywords. Say a good number would be anywhere between 20-30.

Typicaly a sub theme key phrase could be of 2-3 -4 word length.

One recent study suggests that

The typical searcher often uses longer queries. Many contain more than three words. Within three different search engines, keyword distribution data tells a compelling story: Words in Query LookSmart (%) Ask.com (%) Teoma (%) 1 27.00 12.76 38.04 2 33.00 22.46 29.59 3 23.00 19.34 18.13 4 10.00 11.89 8.00 5 7.00* 7.86 3.51 6 - 6.19 1.39 7 - 5.47 0.63

LookSmart does not report beyond 5 search terms, instead grouping five or more terms into one category.

Approximately 40 percent of queries in LookSmart have three or more words. About 32 percent in Teoma have three or more. Ask Jeeves has an even higher skew, nearly 62 percent, because of its natural language focus. Within FAST, database that powers Lycos and others, average is 2.5 terms. That suggests a similar frequency distribution to LookSmart and Teoma.

Hence we can keep average length of sub theme keywords at around 3.

I'm an eBiz consultant and owner of Mosaic Services- an SEO Company. I regularly write and submit articles on various SE specific topics.

Example:

Keywords should be listed in order of importance. Size preferences for meta keyword tags are not same for all Search engines. For example, MSN, will accept a meta keyword tag up to 1024 characters long, while HotBot indicates 75 characters . However, some top-ranking pages of Hotbot's in various categories used meta keyword tags much larger than 75 characters. So, 1024 characters can be used as guideline.

KEYWORDS and KEYPHARASES usage in Header Tags

KEYWORDS and KEYPHARASES usage in header tags is very powerful in SEO(search engine optimization) . As headlines makes a page easier to read and helps in rapidly finding required information, it saves time. Headlines should be short and descriptive. Headline tag text should never have more than one full line of text. It is preferred to use header tags text H2 or H3 tags to gain additional points with search engines.

Header tags text (headline) provides right kind of keyword and key phrase information to search engines which helps in better indexing of website in their database. Header tags text also helps to rapidly inform what page is all about. So, we should integrate KEYWORDS and KEYPHARASES into header tags text (headlines). Heading should start with keywords that are being targeted.. We should use standard headline tags (

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