there don't seem to be additional labels. I didn't mess with anything, I just put in my email addy and password.
One annoying thing is I'm getting notifications of new email from both gmail and k9 - I guess I could turn them off in gmail.
Also, do you know if the k9 notification will disappear on my droid if I've already opened the email @ gmail.com? With the gmail app, it disappears.
Hm, I was having a problem where it was making new folder/labels.
You can use K9 and the gmail app together. As you said, you can turn off the notifications in the gmail app. Alternatively, turn off the syncing of your gmail under phone settings if you'd rather not use the gmail app. (That would save a bit of battery power too.)
As far as your notification question, I'm not sure. You'll have to try it out.
This is the reason I left K9 in the first place. Those extra [IMAP] Folders.
I don't know about syncing the extra custom labels in gmail, but from what loopyloops is saying, if it was a bug in an earlier version of K9, it may be fixed now. Perhaps the [Gmail] namespace setting is not needed????