Aaron D. Campbell

This plugin allows you to list attached files on posts. It comes with a default 
icon set (by famfamfam), with icons for most major files types. You can add 
your own icons, as well as control many aspects of the file list (whether you 
want to show icons, whether to add the lists to exerpts, place them on all posts, 
show them on category pages, etc).

Attachment Manager

This will allow you to better manage how your attachments are handled.  Attachments can be easily listed after posts, complete with icons.

thomstark

Upload, manage, and display files from your server directories or page attachments in stylized lists or sortable data tables. And much, much more.

File Away

Upload, manage, and display files from your server directories or page attachments in stylized lists or sortable data tables.

Attachment Manager vs File Away