Generally I bookmark sparingly to avoid building up a bookmark graveyard but this one earned a permanent slot, and a stop at <a href="Blog" />filterfactory</a> extended that permanence designation, the few sites I keep permanent bookmarks for are sites I expect to use repeatedly and this one has...
Genuinely good work, the kind that holds up over multiple readings without losing its appeal, and a stop at <a href="Blog" />filterfactory</a> kept that going, definitely a site I will be returning to and probably mentioning to others who work in or care about this particular area of interest...