If you are still having troubles, try this command:
That will tell you exactly what kind of file it is.This is what I get after running your wget command to download the file:
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gertboard_sw_10_07_12.tar.gz: HTML document, UTF-8 Unicode text, with very long lines, with CRLF, LF line terminators
So, looks like you got an error page rather than the software. Looking at a "head" of the file, it is indeed an HTML page.
The problem is, I don't see any links to the gerboard manuals any more on the element 14 page. I'm looking in the user manual for my gertboard, and when I visit the link given on page 9, there's nothing there!
This link, which I admit took some finding, should get you the proper file.
http://www.element14.com/community/serv ... /38-101479
but, it saves as a file called "38-101479" which will obviously need renaming
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norman@hubble:~/Downloads/RaspberryPi/GertBoard> wget http://www.element14.com/community/servlet/JiveServlet/download/38-101479
--2012-10-19 10:02:18-- http://www.element14.com/community/servlet/JiveServlet/download/38-101479
Resolving http://www.element14.com (http://www.element14.com)... 188.8.131.52
Connecting to http://www.element14.com (http://www.element14.com)|184.108.40.206|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/zip]
Saving to: `38-101479'
[ <=> ] 37,385 --.-K/s in 0.06s
2012-10-19 10:02:18 (653 KB/s) - `38-101479' saved 
norman@hubble:~/Downloads/RaspberryPi/GertBoard> mv 38-101479 gertboard_sw_20120725.zip
norman@hubble:~/Downloads/RaspberryPi/GertBoard> file gertboard_sw_20120725.zip
gertboard_sw_20120725.zip: Zip archive data, at least v1.0 to extract Zip archive data, at least v1.0 to extract
norman@hubble:~/Downloads/RaspberryPi/GertBoard> unzip gertboard_sw_20120725.zip.