I’ve recently fielded a few questions about if/when various popular plug-ins will be updated to run inside Photoshop CS4 when running in 64-bit mode.  (On 64-bit Windows OSes, you can install both 32- and 64-bit flavors of CS4 in parallel.  Existing plug-ins will run just fine in the 32-bit version, but to run in the 64-bit one they need to be updated.)

Good news: the following developers have already updated their plug-ins:

• Imagenomic’s Portraiture “eliminates the tedious manual labor of selective masking and pixel-by- pixel treatments to help you achieve excellence in portrait retouching.”
• Alien Skin’s Bokeh “provides many techniques for realistic blurring and altering the mood of a scene, from changing the depth of field to placing a radial sweet spot and adding a vignette.”  and Meanwhile up-sizing tool BlowUp 2 “uses an innovative algorithm that temporarily converts pixels to a vector representation which results in perfectly smooth, crisp edges”.
• Digital Anarchy’s Toon It is “a reliable, easy way to give photographs, still images and video frames that sought-after cartoon look. Turn your image into cartoon shading and outlines while preserving the details in human faces and figures.”  The company has also updated Knoll Light Factory 3.0, the lens flare-making toolkit “originally designed by Photoshop co-creator John Knoll to generate Photon Torpedoes in the Star Trek movies.”
• ABSoft’s noise-reducing Neat Image is”indispensable in low-light (indoors, night, no-flash, astro) and high-speed (sport, action, children) photography.”
• PixelGenius’s PhotoKit is “a photographer’s Plug-in toolkit comprising effects that offer accurate digital replications of analog photographic effects.”  Their PhotoKit Sharpener is a “Photoshop Plug-in that provides a complete Sharpening Workflow – capture to creative to output sharpening.”  The 64-bit versions are in beta.
• Topaz Adjust “makes it easy to creatively adjust photo exposure, detail, and color for photo correction and effects.”
• HDRSoft’s tone-mapping Photomatix lets you “reveal highlight and shadow details in an HDR image created from multiple exposures.”
• Artlandia has updated their product line for CS4. SymmetryShop 2 lets you “easily make more sophisticated patterns, from a greater variety of objects, faster than ever before.”
• PictureCode’s Noise Ninja is “a must-have tool for anyone shooting in low-light or fast-action situations — including news, sports, wedding, and event coverage.” The 64-bit version is in beta and can be downloaded from their site, and you can contact the developers if you’d like to know when the update has been officially released.

Developer onOne is working on 64-bit versions, and Nik Software says they’re investigating support.  The list above is just what I’ve happened across so far, so please pass along other examples. [Via Bryan O’Neil Hughes, Carol Steele, Robert Frost, Philip Brown, and Ellie Kennard]