
GlimmerBlocker
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 create problems when Apple releases a new version of Safari. Snow Leopard doesnt support the InputManager-based blockers when Safari runs in 64-bit mode. GlimmerBlocker is implemented as an http proxy, so the stability of Safari isnt compromised because it doesnt use any hacks. It is even compatible with all other browsers and other native Mac OS X applications which uses http, e.g. NetNewsWire.