GlimmerBlocker is a different kind of ad blocker. The problem with other ad blockers for Safari is that they are implemented as awful hacks: as an InputManager and/or ApplicationEnhancer. This compromises the stability of Safari and very often creates problems when Apple releases a new version. GlimmerBlocker is implemented as an HTTP proxy, so the stability of Safari isn't compromised because it doesn't use any hacks. It is even compatible with all other browsers.
Updated on Sep 17 2015