Magic-update

Tim Bray: "There are two kinds of software: the kind that offers to update itself when appropriate, and the kind that's broken." Ideally, once users select a trade-off between features and code maturity (the range is from "bleeding edge beta" to "proven and stable"), the software is then updated automatically. An option to easily revert to a previous version should be provided if feasible.

This goes for both web-based and installed software: the deployment models of all software systems are converging.