How do you collect them, just in a directory or do you use some tool? I also collect sites and web-apps who's UI/design I really like on my personal wiki system

How do you collect them, just in a directory or do you use some tool? I also collect sites and web-apps who's UI/design I really like on my personal wiki system, but it has a lot of flaws, i.e. they're not screenshots so if the site changes I lose the UI. Would love to hear how other people manage this.