I saw a website once where you could type in a search term and it would tell you how often the term is searched on search engines, does anyone know what the site is or something similar? I really need it.
I usually use: http://www.keyworddiscovery.com/search.html and http://tools.seobook.com/keyword-tools/seobook/
In my experience, If you are in second position for a search term, You will get about 30% visitors from the total people searched that term in that day. Nice tool.
Richard- You could also create a google adwords PPC account and set up bids on the keywords in question. In my (limited) experience, this will give you a more accurate picture of how many times keywords are searched. The downsides are that it isn't free, it takes more time, and still may not be accurate if the keywords aren't relevant to the content on your pages.
Try using google trends: www.google.com/trends. You can also use this one: https://adwords.google.com/select/KeywordToolExternal
What are some best practices when using the Keyword Tool? https://adwords.google.com/support/bin/answer.py?answer=64886 With Google Trends, you can compare the world's interest in your favorite topics. http://www.google.com/trends Get quick traffic estimates for new keywords. Traffic Estimator https://adwords.google.com/select/TrafficEstimatorSandbox Tip: You may also use form like this: http(s):// (your local Google site) / (Google services) Use the Keyword Tool to get new keyword ideas. A : https://adwords.google.com/select/KeywordToolExternal B : https://adwords.google.com/select/KeywordToolExternal?defaultView=2 Tip: way A and way B might be different by using different browsers. Overture Keyword Selector Tool http://inventory.overture.com/d/searchinventory/suggestion/ Keyword Forecast The information, tools, and results shown here are based on a sampling of real data and are provided to demonstrate only a proof of concept. http://adlab.msn.com/ForecastV2/ http://adlab.microsoft.com/ForecastV2/KeywordTrendsWeb.aspx