Yeah well, I remember there was a website that had a place to put some keywords and it will tell you the most popular/common related keywords that were being searched. can someone link me to that site. thanks.
You can try out aaron's free tool at this site http://tools.seobook.com/keyword-tools/seobook/ There is also wordtracker and keyword discovery as well. You might have been using overtures keyword tool, however I do not suggest using that anymore as the data is now a year old since they no longer support it.
*cough* http://trends.google.com *cough* If you know the correct way to use trends you'll never need anything else