I use ImageBot, the Firefox addon. It lets you drag and drop items from your computer into it and it then uploads files into Imageshack (or Photobucket, but I don't use it). Also, if you see an image somewhere on the Web, you can right-click on it, select Upload, and it will add it to Imageshack (so you're not draining the original hosts bandwidth if you use it again).
Once it is uploaded, you can right-click on an image and it will copy the code (HTML, BBcode) into your clipboard for posting either the entire image or a thumbnail (these different sets of codes are called templates, and you can make your own). Then you can post your own gems, like this one:
As for video, I've never made one. That Mobly chap had a thread about a video he made the other day, he mentioned a program. Xfire, maybe?