I've looked and looked and this is what I found.
The term "linux server" is showing the exact same decline as "linux". I can't imagine servers are all switching to windows.
"ubuntu server" however is increasing well.
"ubuntu broadcom" is relatively stable (a minor dip in 2009) so, ignoring variations in broadcom popularity, this may indicate a stable flow of new people trying linux.
"osx" is declining at a rate much much faster than "ubuntu"
Other weak conclusions discovered by google trends include....
"Windows crashes" seem to have increased since the release of windows7
as have "alien abduction". Whiles windows7 seems to have also virtually cured us of "recession".
Also lets not overlook the massive reduction of people who think "linux sucks".
"Kittens" may be steadily losing their appeal but perhaps they're cheered up by the sudden lake of interest in the arch rivals the "puppys" starting from late 2008, a tread sadly followed closely by "puppy linux".
In the end its as I always predicted... We "love" more, "hate" about the same and "murder" less and less of our ever decreasing number of "friends".