http://wordpress.org/extend/plugins/super-image-plugin/
Super Tools is an image manage plugin that can do the following
It can add watermark to image when you upload image in WordPress.
It can add two kinds of watermark, picture and text.
It can add watermark to all image in your WordPress.
It can download remoted image and add watermark.
http://wordpress.org/extend/plugins/wp-note/
WP Note lets you create notes in you wordpress posts to make them stand out more.
http://wordpress.org/extend/plugins/...be-flv-player/
This is a custom flash player that plays youtube videos without using the default ugly player.
It takes advantage of actionscript and the youtube API.
Its based off of:
http://emehmedovic.com/xmca/toobplayer/