gistfile1.txt

How I created a Google Apps jtauber@jtauber.com gmail account when I already had a Google Account called
 jtauber@jtauber.com:

1) While signed in to jtauber@jtauber.com Google Account, I created a temporary @gmail.com email address.
This effectively enabled me to alternatively log into my existing Google Account via that @gmail.com address
2) I logged out and signed up for Google Apps with username admin@jtauber.com
3) I added a 'jtauber' user under the jtauber.com Google Apps domain and gave it Super Admin privileges.
That effectively shut out my ability to log into my original Google Account with jtauber@jtauber.com but
I still can using the temporary @gmail.com address created in step 1.

Note that anything linked to original jtauber@jtauber.com Google Account was now under the
temporary @gmail.com. This included google groups, google analytics, web alerts, etc. So:

4) Logged into various Google services like with my temporary @gmail.com address and added
 jtauber@jtauber.com as an admin

The missing piece is my jtauber@jtauber.com Google+ account is still under the temporary @gmail.com address
and can't yet be moved. But I believe Google is working on something to let you migrate Google+ accounts.