Here is a link to Jason's pics of his work area. The inbox is in number six, and the last one is his file drawer:
http://jasonwomack.typepad.com/photos/office_productivity/
http://www.staples.com/webapp/wcs/s...d=-1&cmArea=FEATURED:SC1:CG22:DP1498:CL140985
And this is a nice photo from flickr of someone's desk with the stacking letter trays:
http://www.flickr.com/photos/urlgrey/62843879/
I get the Eldon plastic ones, six to a box, for around $10 (US). Staples carries those, too, but the first link I saw was to the Staples one.
And another type:
http://www.flickr.com/photos/paulgoode/6238657/
Re the file drawers.
Here are links to views of the type of file drawer DA is talking about--the not-hanging-file drawers:
http://www.flickr.com/photos/97629913@N00/57839225/
http://www.flickr.com/photos/bjornb/53538233/
http://www.flickr.com/photos/iheitlager/41922174/
http://www.flickr.com/photos/pbyrne/34126417/
http://www.flickr.com/photos/dhill/8017194/
http://www.flickr.com/photos/jazzmasterson/1895715/
The files are standing directly on the bottom of the file drawers, not in hanging files.
These are links to pics of hanging files (and one shows the tabs and plastic inserts you might want if you go with with hanging files):
http://www.flickr.com/photos/timothymorgan/51240974/
http://www.flickr.com/photos/arnoutdrenthel/23581495/
http://www.flickr.com/photos/arnoutdrenthel/23581484/
http://www.flickr.com/photos/scholz/18618080/
http://www.flickr.com/photos/offpoint/6207984/
http://www.flickr.com/photos/benchristen/3902110/
I have the hanging files, because my file cabinets aren't made for the files to be standing on the bottom. If you stand the files directly on the bottom of the file drawer, they get heavy, and some of the assemble-it-yourself file drawers aren't sturdy enough to hold the weight, and the files will pop the bottom of the drawer. And I like hanging files anyway. (Can't tell if you're American but in Europe the hanging files are called suspension files, if that helps). And I have a roll-around wire file drawer that works only with hanging files, anyway.
And as you see from the flickr photos, people use the hanging files quite a bit--either kind works. I think hanging files are a little bit neater-looking. You don't really even have to use the plastic tabs and inserts--you can just put in several manilla folders per hanging file, and have the folders all alphabetized, sitting in the hanging folders. Also if you use the hanging folders you can get box bottom ones that hold thicker files neatly. And there are hanging files that have closed sides so things don't fall out.
I only see the metal plates at the back of file drawers in metal desks, usually the functional metal office type desks, and in metal filing cabinets. If you have the wooden filing cabinets, especially not the top-of-the-line, most epensive ones, I don't think you'll find the metal plates at the back, that can be moved to compact the files and keep them from falling over. Of course if you get a filing cabinet without the metal plates, you can get a book end to fit behind the last file, maybe one with cork or a magnet on the bottom.
Hope this helps.