Found some extra time to listen to one of Phil's S60 podcasts (Podcast #28). The most recent one is an interview of Tommi Sihvola, one of the inventors of Widsets. (Quick summary: Widsets are mobile widgets that enable anyone to create, publish and share internet content to be accessed on their mobile phones. The Widsets on the phone are basically a Java application running the small widgets inside.)
In the interview, Tommi talks for example about how and why Widsets got started. It was interesting to hear that their first target phone was Motorola Razr... which basically forced to be really aware of the available resources (good thing in the long run!).