Streamingmedia.com recently posted an excellent article detailing the best video mixers buyers are looking for, to get started live streaming. Putting together a multi-camera shoot is no simple task. There is a wide variety of switchers and encoders, as well as software encoders and hardware encoders to pick from. This article is a tremendous resource in picking your mixer.
NewTek's TriCaster Mini is an advanced, top of the line, but easy to use production system in a small form factor. This makes it perfect for professionals and those just learning video alike.