Neat project. One critique: I don't like having only five lines of the snippet visible at any given time, it makes it harder to easily understand what's going on in some of your longer snippets.

I suspect that the five line limitation was done so that the "Give me another one!" button was always in relatively the same place and easily clickable (I appreciate that), but perhaps there could be a small, duplicate text link up above the snippet for this purpose too, thereby also letting you make the snippets longer.