@netmeg given what I've seen on Google's help pages before, expect them to correct that mistake sometime between 6 months from now and when h3ll freezes over.
This is an even bigger issue for sites where two words in the brand start and end in the same letter. Take an example like "WidgetTypes" for example. Being able to advertise www.WidgetTypes.com is better for brand recognition that www.widgettypes.com. I know from experience that in those cases a ton of users end up typing www.widgetypes.com
It really sucks when the advertiser doesn't happen to own widgetypes.com