Lpc2000

I provide a web site where compiled versions of the GNUARM tools are
hosted, www.gnuarm.com.  I can pretty much leave it alone and it
generates enough revenue from the Google ads to pay for the high
bandwidth it needs.  But the last few months even though the bandwidth
has not dropped, the revenue from people clicking the Google ads has
dropped off.  

It would appear that fewer people are clicking the ads even though
they are still downloading the files.  I would like to try to optimize
the ads to match what people are interested in learning more about.  I
only have indirect control over the ads, but I can tune the pages a
bit.  Mostly the ads seem to be about other development tools, some
for the ARM, others for CPU independant designs like Ethernet.  If
people aren't interested in these ads, what related items might you be
interested in?  If a professional designer is downloading the GNU ARM
tools for commercial use, what other tools would he be buying? 

I need to find a way to boost the click through revenue again or I
might not be able to keep the pages up.