EagleFiler [via] is a new competitor to Yojimbo, with similar functionality and equivalent price. (Funny I always label those as “Yojimbo competitors” even though there existed a bunch of equivalent — and more powerful — applications before.)
Good points: the simplicity of hitting “F1” in Safari, NetNewsWire or Mail, and having the contents copied to EagleFiler (I never liked Yojimbo’s “Quick Input Panel”, which is anything but quick); multiple customizable tags rather than single labels; the ability to create custom import scripts.
Bad points: hitting “F1” in Mail imports a mailbox, rather than an individual message; no custom smart folders (but at least there’s one smart folder per tag); the unpolished user interface and icon (yes, that matters a lot in a GTD-ish app); you can create and type rich text notes, but if you want to edit them afterwards you have to open them into TextEdit (this is the most annoying, but it should be simple enough to fix in an upcoming release).
Since Yojimbo and has more functionality (drop dock, password management, encryption, and of course the ability to edit notes) and looks and feels better, I see no reason to switch.
Some campaigns have even dispatched young staffers known as “trackers” armed with video cameras. Their sole job is to track a rival candidate’s every move and make sure their cameras are rolling in case the politician makes a gaffe — and uploading them to YouTube.