From Samsung Canada on facebook:
We are continuing to investigate issues that some users have reported while completing the upgrade to Android 2.2. In the interim, we are taking the extra precaution of temporarily suspending the upgrade as a download from Kies. We apologize for the inconvenience and ask that you contact 1-800-751-4078 or sh.support@samsung.com if you have any further questions. Many thanks.
We are continuing to investigate issues that some users have reported while completing the upgrade to Android 2.2. In the interim, we are taking the extra precaution of temporarily suspending the upgrade as a download from Kies. We apologize for the inconvenience and ask that you contact 1-800-751-4078 or sh.support@samsung.com if you have any further questions. Many thanks.

