One little tip I suggest is check out
http://www.wordtracker.com They have a free trial program that you can run as many times as you want.
Enter a few keywords you want to target, and it will give you alternative selections. You can select up to 30 keywords, or combinations of keywords then poof..it shows you how many requests there have been made on Alta Vista for the past 24 hrs, and how many competing sites. It also gives you what they call KEI Analysis, how "good" the keyword is given these factors.
I've found some niche keyword combos this way that you can sprinkle in your pages for SE fodder.
I've never tried the paid version, but it will search all the major search engines and give you the same info.
I found one that was a misspelling that had a KEI of like 4000, (400 is good) and not a misspelling I would have considered. I thought that was kinda neat.
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