If you wish to delete photos from iPhoto, you must first understand the difference between events and albums. However, you can still use Albums to delete photos if you know how. You can also use flagging to select photos to delete. There are several ways to review your photos before you delete them, and you can also archive photos as files before removing them from your iPhoto library.
With "My Queue" you can quickly save videos to watch later.
To add an item to your queue just click the sign next to the video.
Once you've added a video visit "My Queue" to start watching!