In addition to previous post, the free utility synonymbase.com for selection keywords and as similar(wow!) keywords for your website. KeywordSpy costs money - SynonymBase not. Sorry for my english, im from Thailand.
ginger | Homepage | 03.08.09 - 8:05 am | #

You might also find this free keyword brainstorming tool a great aid in identifying more keywords related to your initial keyword.
Joel | Homepage | 09.27.07 - 5:04 pm | #

Can also give KeywordSpy.com a try for a keyword research tool, with results actually reflecting what advertisers are using at the current time.
Arupa | Homepage | 06.07.07 - 1:07 am | #

Great list. I think it is important for marketers not to become too reliant on one tool. It's easy to "fall in love" with a keyword tool and rely on it, but you've got to compare the results of multiple tools to get an accurate picture.
Todd | Homepage | 09.20.06 - 7:07 pm | #

I also found some very useful utilities at www.nichebot.com.

Thai
AdSimple
Thai Nguyen | Homepage | 06.16.06 - 11:58 pm | #

I think Wordtracter is the most exact keyword tool around, but also it gave me some inaccurate results in the past.

Overture number are much inflated.

Regards

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Mozzilla Fan | Homepage | 02.24.06 - 10:57 pm | #

The focus must be on what's relevant for your content. Also, geography, seasonality and context.
Lee Odden | Homepage | 10.19.05 - 12:36 pm | #

Inspite of knowing good keywords, its always a hard choice to select one. Competition always exists
Rajkumar | Homepage | 10.19.05 - 3:59 am | #