Hope this helps... https://adwords.google.com/select/main?cmd=KeywordSandbox --edit-- Try this as well... http://www.submitshop.com/keywords/search.html
Keyword picking is 'old hat' years ago what you put in your tags was what the bots looked for, these days the search centres on 'keywords' used on your page index names and terms used within the content. So don't get angry, get even!
It doesn't tell you the actual number of searches, but google suggest can give you some interesting ideas, especially for keywords related to ones you are already targeting