IMCE

#D7CX pledge: There will be an IMCE 7.x release on the day that Drupal 7 is released.

IMCE is an image/file uploader and browser that supports personal directories and quota.
Features

* Basic file operations: upload, delete
* Image(jpg, png, gif) operations: resize, create thumbnails, preview
* Support for private file system
* Configurable limits for user roles: file size per upload, directory quota, file extensions, and image dimensions
* Personal or shared folders for users
* Permissions per directory
* Ftp-like directory navigation
* File sorting by name, size, dimensions, date
* Tabbed interface for file operations
* Keyboard shortcuts(up, down, insert(or enter), delete, home, end, ctrl+A, R(esize), T(humbnails), U(pload)).
* Built-in support for inline image/file insertion into textareas
* Multiple file selection(using ctrl or shift)
* Ajax file operations
* Themable layout using tpl files

How to integrate into WYSIWYG editors

WYSIWYG API (FCKeditor, TinyMCE, etc.): Install IMCE Wysiwyg API bridge and enable IMCE as a plugin in WYSIWYG administration.
FCKeditor and CKeditor(standalone modules): Admin->Settings->Fckeditor profile->File browser settings->IMCE integrationread more