Dreaming of Starting a One-Person Software Company?

Peldi wrote a detailed post about the hows and whys of starting up Balsamiq, his one-person software company with a cool name. It's good reading for anyone dreaming of throwing in the day job and starting up shop. My opinion: Peldi had the benefit of skill and luck: skill, in that he seems to be blessed with a broad range of skills one needs for such an endeavour; and luck, in that the niche he chose for his first product has turned out to be a very good one.