After talking about spyfu in a recent post, I started doing some digging around to find other useful keyword tools. These keyword tools will give you the background information you need, so you can decrease your risk when investing in an affiliate or arbitrage campaign.

5. KeywordTrackerWordtracker

Very powerful keyword research tool, and it has a free trial that is worth trying out.

4. Niche TaxiNiche Taxi

Allows you to isolate a niche and gather information on it before you start getting down to work.

3. Keyword DiscoveryKeyword Discovery

Probably the top choice for professional web marketers, I have not tried this service out yet because of its price tag. If anyone has used this service let me know!

2. Google Keyword Tool (Site down right now couldn’t grab the logo)

This Google tool shows the search volume and suggested keywords. This is a very strong tool and you do not need to be logged in to your Adwords account to access it.

1. seobook
SEO Book Keyword Tool

This tool pulls from multiple results and displays information like monthly search volume, and links to more suggested keywords to target.

New Addition: KeywordSpy
KeywordSpy.com
This site allows you to see your competition’s keywords. This tool is capable of creating massive keyword lists that only take a few minutes. For more info check out the full post here.