Here are some more plugins that work with K-Meleon:
Alternatiff for Netscape
http://www.alternatiff.com
Plugin file: npzzatif.dll
LuraWave Plugin for Netscape:
http://www.luratech.com/products/download/fs_e.html
Plugin files: npldf.dll and nplwf.dll
Those 2 installed just beautifully (try to direct the installation into K-Meleon\plugins.
Flatland Rover Plugin (www.flatland.com) for Netscape also works with K-Meleon but you must have a fake folder C:\Program Files\Netscape\Communicator\program\plugins\ before installation. After the installation copy NPRover.dll and the directory Flatland from there into your K-Meleon plugins folder.