I tried to download jpegtran automatically. It failed. Automatic update message "jpegtran was not installed, check permissions on the wp-content/ewww folder." The permissions are the same as the optipgn and gifsicle, which installed and worked.
I downloaded jpegtran manually, placed it in the directory with the same permissions as optipgn and gifsicle and it is not recognized in the plugin.
jpegtran: MISSING Install automatically | manually
optipng: OK version: OptiPNG version 0.7.4
gifsicle: OK version: LCDF Gifsicle 1.68
Graphics libraries (only used for conversion, not optimization): GD: OK Imagemagick 'convert': OK
safe mode: Off exec(): OK shell_exec(): OK
Only need one of these: finfo: OK getimagesize(): OK mime_content_type(): OK
optipng path: /services3/webpages/util/t/o/toddmb.site.aplus.net/betterthanaverageblog.com/public/wp-content/ewww/optipng
gifsicle path: /services3/webpages/util/t/o/toddmb.site.aplus.net/betterthanaverageblog.com/public/wp-content/ewww/gifsicle
disabled functions: phpinfo
gifsicle permissions: 0755
optipng permissions: 0755
wp-content/ewww permissions: 0755
Operating environment: Linux 22.214.171.124.With.Authcache+Pxeboot_Cmdline_4096 #1 SMP Mon Dec 13 21:56:57 EST 2010 i686