All the different thumbnail sizes of a YouTube video are accessible from a standard format. All you need is the unique video ID (viewable in the URL of your video).
Thumbnail Image Format: http://img.youtube.com/vi/THE-VIDEO-ID/FILENAME.jpg

The file name depends on which thumbnail size you are looking for. There are several to choose from…

While managing a few projects that were built by freelancers, I came up with a list of guidelines for the build and for WordPress used as a CMS. I’ve added reminders to it based upon the mistakes that fly in the face of what I consider a “good” build. Note that some of this is a matter of preference and opinion. I thought I would put this out there as a starting point for anyone trying to put together their own guidelines…

This jQuery script will automatically hide all excess list items past a maximum number. It then dynamically adds an expand/collapse link that uses the slideToggle effect. Each list item is collapsed in succession to give the appearance of using slideToggle on a container. The max number, speed of animation, and expand/collapse HTML can be passed as options.