I just can't get enough of Google Trends.  If you haven't heard of it, Trends is one of many amazing marketing tools in Google's repertoire which can be used any any interested party.  I'm not sure if it has a lot of practical value, but it sure is fun.

Basically, Trends allows you to view the popularity of any search term you can think of over the past 5 years (ca 2004).  Moreover, Google even matches the popularity to news breaks current as of that time.  

Just for fun I did a few random searches. 

Health Care
Here you can see that searches for "Health Care" jumped within the past 5 or so months - more or less congruent with references in the news.  Interestingly, it appears that searches are lowest in December.  

ADHD
If you want an example of yearly trending, check out "ADHD."  It's no surprise that searches for ADHD are lowest in May, June and July.  I'm going to go out on a limb here and say that school influences cultural interest in ADHD.  

Medical School
I thought this one was pretty interesting.  It seems searches for "Medical School" have been dropping steadily over the past 5 or so years.  Could it be that people are losing interest in pursuing medical school?  Is there another factor at work?  I can't explain this one, but if you've got any suggestions, I'd be interested in hearing them.

Apparently Google limits the amount of searches you can perform in a day, but still a cool tool.