The first time you run calibre it should create links to those binaries. I bought a mac for my birthday, let me see...
Code:
$ ls -l /usr/bin/web2lrf
lrwxr-xr-x 1 root wheel 60 Feb 15 18:15 /usr/bin/web2lrf -> /Applications/calibre.app/Contents/Resources/loaders/web2lrf
$ ls -l /usr/bin/html2lrf
lrwxr-xr-x 1 root wheel 61 Feb 15 18:15 /usr/bin/html2lrf -> /Applications/calibre.app/Contents/Resources/loaders/html2lrf
$ ls -l /usr/bin/calibre
lrwxr-xr-x 1 root wheel 60 Feb 15 18:15 /usr/bin/calibre -> /Applications/calibre.app/Contents/Resources/loaders/calibre
$ ls -l /usr/bin/calibredb
lrwxr-xr-x 1 root wheel 62 Feb 15 18:15 /usr/bin/calibredb -> /Applications/calibre.app/Contents/Resources/loaders/calibredb
Can you use the terminal app to check if those links are there? I'll do what I can but I'm leaving for India Tuesday. If we can't figure it out before I'll be back after the first week of March and I'll do my best to help you out then.
I had high hopes for adding a large set of features, but time hasn't permitted it. When I get back I'll focus more on adding debugging code and making what already there work better.
FYI, if you want an easy way to check your settings; entery about
:config in your address bar and bookit in the filter. That will show you all the bookit perferences. extensions.bookit.calibre, extensions.bookit.calibredb, extensions.bookit.output and extensions.bookit.web2lrf are paths I would check.