PDA SYNC
Jena,
I had the same problem. Here's what I did:
If you open the folders view in Ecco, you will see a folder called New Columns. Under this folder is another one called Notes. Add the notes column to your To Do Notepad. Now, unfortunately, this is not a popup column; it's just a text column, but I just type it "home" and "office" etc as my GTD context for the category...
Now, go to the PDA SYNC settings menu. Choose the mapping tab and then select tasks. Then click the mapping button. You should see, as the fifth field from the bottom on the Ecco side, the field Notes. Make sure you're not looking at Outline Notes, just Notes. Now map Notes to the Task's Categories field.
That's it. It's not the most elegant design, since you have to type in your categories in Ecco, instead of selecting from a list, but it works.
--David