I'm in the process of converting known adware, etc blocklists to IE's InPrivate Filtering supported format XML. I'll have to e-mail the authors of such blocklists and check whether or not it will be OK to make them available for everyone. If yes, I'll host them at Rapidshare and post the links over here. You can import whichever list you wish. Too many entries may cause slowdowns when opening IE, though. I'm wondering if it would be possible for Microsoft to optimize InPrivate Filtering so that it's able to handle large entries. I guess Microsoft never considered this possible scenario, hence if we place too many entries it becomes slower than without them. It's a matter of contacting with them and see what they can do. I'll keep you posted.