I've yet to be able to get the system to work with open meta tags but I'm happy with the progress so far. Here are the basics on how I autotag with Hazel.
Everything is explained in this post in the Hazel forums about going into subfolders Hazel SubFolder Post by MrNoodle
Here are screen shots of how I applied for my locations and what I wanted to do.
What this means is that I'm able to do a spotlight search for fromBossesName and a descriptor and find files pretty quickly. Like I mentioned in my previous post, the key for a system is recognizing how you remember something about the file. For me, I'm often remembering that document that Jimmy sent about Project X timeline. Searching for timeline and project x is usually not enough.
Some discussion of the system:
Files are saved via applescript to subfolders based on the senders email from MacMail. These are in a Attachments folder in my documents folder. From there, Hazel can autotag by folder name. The 3rd picture shows the detail of how I am doing this. Once tagged, the files are moved to my inbox for further processing.