If you've read my views on the subject, you will know how highly I rate keyword selection.

These are some good tips on the practice - "Wide-net" Keyword Research for PPC and SEO.

To see what the most commonly used search terms are - take a look at: Google | Yahoo | Windows Live.

Some more on key words, and essentially this article - what's the best use of keyphrases? - spells out what the search engines already tell us - but it makes things clear.

This article - keyword research for PPC - looks at the same issue, but makes the case that keyword selection for SEO and paid ads is not the same. This article - Selecting Keywords to Boost Your Traffic, an Essential Task - gives practical advice.

I don't normally link to 'tools', but this one from Google gives recommendations based on what folk are using - Google's Keyword Tool.

Despite its title, this article is about keyword selection - Homestyle SEO: How to Cater to a Regional Audience. I think the value of this cannot be underestimated - in reality, few products will actually sell around the world [for my comments on this subject see is e-commerce really global?].

This excellent article starts with keywords - but moves on through segmentation and then how to develop your site to suit a target audience - How To Target Your SEO Landing Page’s Demographic Profile.

Here is a two-parter from one of the best in the subject, Jill Whalen - Avoiding SEO Brain Freeze Part One - Hunting For Keyword Phrases, and Avoiding SEO Brain Freeze Part Two -Creating a Keyword Phrase Map.

A list of 'don'ts' can be easier to follow than 'dos', so here is one - Eight Keyword Research Mistakes That Are Costing You Money.

This article - Words that work: search words versus website words - gives some sound advice on matching website content with the search terms that potential customers might use.

The point of this article - Who Owns The Search Page? - goes deeper, but I have had this discussion about keyword selection with businesses sooooo many times.

If you are only going to read one article on keywords, this is it - B2B Keyword Research When You’re in a Niche Market/Industry - I particularly like the opening line: "One of the difficulties in online marketing deals with finding the right keywords, at the right time that are being used by the right people" - spot on. And do not be put off by the B2B/niche reference in the title, the points raised are relevent in all keyword selection.

This - SEO Tools for Work and Play - is a great article for two reasons; [1] it explains keyword density, and [2] it introduces a great free tool.

For a guide to the long tail of keywords, take a look at - Seeking The Holy Grail Of The Long Tail.

Here's some good stuff in 3 Ways To Use Google’s Search Results For Keyword Research - its title tells you what it is about.