Today is the 15th Anniversary of Smile software. Smile is a great little software company that makes apps I use every day. Smile's co-founder, Greg Scown, shared some of the Smile story with Stephen Hackett over on 512 pixels and it's worth reading. With the rise of mobile and the software monetization model getting re-written (multiple times), there aren't many software companies that survived the last 15 years. Having spent time with the Smile gang, I'd have to say their secret for success is an absolute belief in their products and their customers.
Disclaimer: Smile sometimes sponsors the Mac Power Users and this site.