I think my lil mac screen capture app is actually a pretty good example, originally in v1 it only uploaded to imgur and had no UI except for the menu. V2 I added advanced features like a preferences window and history.

http://captured.codeography.com

While building this I did try hard to focus on what I could do to ship right away, and nothing more. Even for v2 I had to concentrate on limiting the features, which was quite the challenge. At this point, I cant even remember half the things that I needed to implement.