PicLens is the most spectacular add-on for Firefox I happened to try in a while. It adds a cool and usable “3D wall interface” for navigating pictures from Flickr, Google Images, MySpace, deviantART, Facebook, Yahoo and other sites. You have to try it for understanding how much it can change your browsing experience, but I recorded a video demo that might give you an idea.
I remember a day in late 2004 when I almost cried for the happiness when I discovered a standalone utility for playing Flash Video files (FLV). It saved me a lot of time because it allowed me to playback immediately videos in FLV format, without even opening the Flash editor: it was just a double click on the file name or a drag-and-drop over the utility. That could have been somehow handy for a common user, but for a developer involved in Flash projects with video was super useful: it became immediately one of my most used Flash companions.

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