These keys are from Chinese forums..
According to the forum members, they are still valid.
Although these keys have been published on the Internet many times
since March 2006, for unknown reasons, Microsoft didn't stop these
keys.

If you own a copy of Volume License Windows XP Pro SP2, and your
current key is no longer valid,
try the keys below.

One of the key that I just double confirmed that 100% function, can
pass WGA and get IE7 installed, on 8th Nov, 2006, is the last one on
the list
HCQ9D-TVCWX-X9QRG-J4B2Y-GR2TT

***************
These keys are for Windows XP Professional SP2 Volume License Edition

MRX3F-47B9T-2487J-KWKMF-RPWBY
QC986-27D34-6M3TY-JJXP9-TBGMD
CM3HY-26VYW-6JRYC-X66GX-JVY2D
DP7CM-PD6MC-6BKXT-M8JJ6-RPXGJ
F4297-RCWJP-P482C-YY23Y-XH8W3
HH7VV-6P3G9-82TWK-QKJJ3-MXR96
HCQ9D-TVCWX-X9QRG-J4B2Y-GR2TT