Hey Bill, I don't know if this sounds like something too worrisome, but something you could potentially do is look through your analytics, match the keywords getting you traffic with the landing pages, and see if they're optimized.  Are the pages answering the people's questions clearly?  Is it giving them content that would lead them to want to read more?

For keywords that have high bounce rates (besides [tools] of course) you may want to make a page that specifically answers the searcher's questions, and perhaps end the article with a call to action to another page of your site, something that will intrigue them and get them to stick around longer.  But at least make sure the landing pages are optimized for the keywords people are finding them from.