This post in the above threadlink got me thinking about all the threads i've come across in recent weeks/months on Y! bannings. Seems there might be some truth in DaveN's thoughts on IP bans.

I thought it might be helpful to list a few of the more prominent threads in one place as they're spread fairly widely:

• Kicked from yahoo? - seochat
• The whole darned ISP got banned! - WMW
• You've heard it all before: company URL vanishes from index - SEW
• banned by yahoo? - seo-guy
• Is Yahoo stripping directories from its SERPS? - digitalpoint

You'll notice that the above threads all bear the hallmarks of a class C filter. I've no doubt missed dozens of others, feel free to add them as comments...

A Possible Solution for Distraught Site Owners
This was posted by a Y! rep at SEW:
How to Get a Site That's Banned REVIEWED by Yahoo

Would it be too much to ask to have a Y! rep make a comment on this here or anywhere where webmasters can see it?