I've been in som discussions with the infrastructure guys on what to do with the Public Folders and if they should all be moved to SharePoint or not. I think ther has been som confusion here, and Microsoft has released some guidelins on what to do: Public Folders are NOT DEAD!
They will be around for a long time, and sometimes they should be used. NOT everything belongs in SharePoint. SharePoint will NOT be the silver bullet to all our troubles... but some :-)
Read the blog/article: Public Folder vs Sharepoint Guidance