Data Point:

Asked NWA to match my UA Prem Exec (*G) membership using the fax number provided in this thread.

12-14 days later, received an email (below) confirming Gold WorldPerks / SkyTeam Elite.

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Dear Mr seanp7,

Thank you for contacting Northwest Airlines in regard to upgrading your
WorldPerks account, <number>

A variety of criteria, including information from your United Airlines
mileage summary, is considered when evaluating requests from members to
match elite status from another airline. After reviewing the
information provided to us on your Mileage Plus account, your Northwest
WorldPerks account has been upgraded to Gold Elite status. This
one-time complimentary membership upgrade will remain valid through
February 29, 2008.

Your credentials are now being processed and will be mailed to the
address on file. You may expect to receive your Gold Elite kit in
approximately three weeks.

In the interim, WorldPerks Elite members are now able to print off their
temporary WorldPerks reference card through nwa.com, if a PIN is
established. From the nwa.com Home Page, select WorldPerks, then Manage
My Account, then select Request a WorldPerks Reference Card, or click on
the following address at:

https://webx25.nwa.com/cgi-bin/wp_card.pro

If you have difficulties with the process, please contact our online
support group at [email protected] or 1-800-692-6955 open 24/7.

In order to requalify for the 2008 program year (01MAR08 through
28FEB09), you must accumulate the minimum elite qualifying mile or
travel the required qualifying segment thresholds through December 31,
2007. Actual flight miles must be earned on Northwest, KLM, Alaska
Airlines, Continental Airlines, Hawaiian Airlines, SkyTeam Alliance
members or Northwest-designated flights operated by other WorldPerks
partner airlines. Bonus miles and partner mileage credit do not count
towards the annual elite qualification threshold.

We sincerely appreciate the support we receive from our members. We are
working hard to distinguish Northwest Airlines as a carrier of
preference and we hope you will allow us the continued privilege of
serving your air travel needs.

Sincerely,

<name>, Manager
WorldPerks Service Center