Google keyword tool is very helpful for keyword research but I still prefer keyword discovery. To add up, IBP is a great tool to check keyword rankings.
Hi, Google adword is good. here is the link: https://adwords.google.com/select/KeywordToolExternal Thanks!
I also use Google adwords tool. It can show you the popularity of the keywords. You can also use wordtracker for keyword research.
Fix your popup, it had NO close option and you can read the article without getting rid of it. Just wondering, what popup script you are using ?