Here's a listing of their filters:
3M™ Privacy Computer Filter PF400

Seems nothing larger than 20", and doesn't say whether widescreen...
I guess you can always contact them

Using google, seems Targus makes a 22" WS Privacy filter:
http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=8250611&oext=1038A&ci_src=14110944&ci_sku=8250611

Kensington makes one too:
http://www.beachaudio.com/Kensington/55771-p-116477.html

Thanks for the reply DeathRider.  I was actually hoping for a review or some first-hand experience with one of the products.

 

I went ahead and purchased the PF22.0W privacy filter from 3M.  Their website indicates this is for a laptop (which seems odd, how many 22" widescreen laptops are there out there?).  But digging deeper into the documentation, it does say for laptop or desktop monitor.  So, I decided to give it a try.

 

The filter is just a thin flexible sheet.  No frame.  It comes with 8 small adhesive tabs which can be attached to the monitor to hold the filter in place.  I found however, that the filter fits quite nicely within the frame of the Dell UltraSharp 2208WFP monitor.  It stays put very well.  I didn't even use any of the adhesive tabs.  The filter is also reversible, with one side being a matte finish and the other being glossy.  Taking a couple steps to left or right of the monitor yields a significantly darkened image on the monitor.  A third step makes the image completely dark and unreadable.  Perfect for our needs.

 

So, in case anyone else out there stumbles upon this post, the 3M filter does work with the Ultrasharp 22" monitor.

 

HTH

Grey Ferret

 

Thanks GF for the review.