Simple Image Widget
Using this widget you can easily place an image in the sidebar. You can also specify a URL to link to when clicking on the image. Supports multiple instances, so you can use it multiple times in multiple sidebars. It not only works with sidebars, but you can use it to place images on your website that accepts widgets. Download

Simple Video Embedder
Easily embed video within your posts. Adds a widget to the posting screen that enables you to post videos by simply providing the URL to the video hosted on common video sharing websites. Download

Audio Player
Audio Player is a highly configurable but simple mp3 player for all your audio needs. You can customise the player’s colour scheme to match your site design. Download

Tubepress
This plugin has a very simple and easy to use configuration page that lets you display awesome YouTube and Vimeo galleries in your posts, pages, and/or sidebar. Download

Shadowbox JS
Shadowbox is an online media viewing application that supports all of the web’s most popular media publishing formats. Using Shadowbox, website authors can display a wide assortment of media in all major browsers without navigating users away from the linking page. Download