I managed the tech/product aspect of Opera Mini and its direction for most of its first decade (we started in late 2004). There's 250+ million monthly active users of it now (most in places like SEA, Russia, India, Africa, South America). Reading stuff like this is quite rewarding.
This post somehow made me think of the first English language blog post from early 2006 that really appreciated what we (me and my team) accomplished:
http://www.russellbeattie.com/blog/1008770
"Opera Mini: Best Mobile Web Browser Bar None
Posted Tuesday, January 24, 2006 12:41 pm"