Sharepoint Library Basics

Library Folders - no description or meta data as Standard

While you can add a new folder in a document library it has only one piece of meta data associated with it - name. Typcially intranet users want to see a description next to the folder.

You need to create a new website content type thats based on the content type 'Folder' and use this instead. Once created you can include it in any library.

http://www.mindbusiness.de/blog/2007/05/02/sharepoint-folders-and-metadata/

No PDF icons for files as Standard

PDF files have a blank icon associated with them, do the following making sure your PDF icon is 17*17

http://support.microsoft.com/kb/837849