I was informed the Microsoft adCenter will be offline on Saturday to do upgrades. And they tacked on the information about improving the negative keyword to allow them at the category level.
Their press release read:
This Saturday, June 23, 2007, Microsoft adCenter will be upgraded to allow you to manage negative keywords at the campaign level, in addition to several features to improve performance.
During this upgrade, adCenter will be temporarily unavailable for up to 14 hours, starting at 10:00 A.M. Pacific Time. Your ads and keywords will remain live and continue to run as usual, during this time.
To help you better manage your campaigns, I'd also like to share some feature reviews from the previous adCenter upgrade:
· Editing your keywords in bulk and previewing ads
· Creating multiple account performance reports and information on misspelled keyword management
· Importing campaigns from other search advertising programs
UPDATE: The adCenter update was postponed, according to the adCenter blog. No timeline was given for when the ability to manage negative keywords at the campaign level would become available.