Yesterday a lot of new portals appeared. Some of them are misplaced more than a hundred meters. How do I report those and supply a better position?
You can report an issue about portal locations at Ingress Support Page, press
EDIT 03/12/2013 : As mentionned by @Ilari Kajaste in comment, this way send you back to the mobile client.
To report a misplaced portal location, you'll have to go to this portal (or get a key of it) and :
You can open the portal screen, and click the triangle with the exclamation mark in it.
You then have a choice as to what you want to report. Be aware that it can take some time for Niantic to actually update the portal.
(And I mean a really long time)