Secondary Research Tool

What keyword research tools do you guys use?

I've been using Market Samurai (great tool) but lately the link in to the Google keyword tool has been bugged out or failing.

I have a few webs that I am attempting to research new keywords but my dependence on Market Samurai is stopping me cold. This afternoon the keyword tool went down again. It's saying that Adwords is down for maintenance but I am able to log into my Adwords account with no trouble.

I do, or rather did (I lost this) use a PHP script connected with AdWords API. It does cost a little, but you've got really nice access to this data. I suggest you to do the same, it's really flexible and reliable.