June 1, 2012
The Pantone Color Libraries have been updated in Photoshop CS6 and are now called Pantone +. In order to work with legacy files, you will still find both the Pantone solid coated and Pantone solid uncoated libraries in Photoshop CS6. If needed, you can load the older books (like Pantone Solid Color Euro) from PSCS5, but you should know that Pantone/X-Rite no longer support the older, legacy color libraries.

January 20, 2011
Photoshop has two options for saving swatches from the Swatches Panel: Save Swatches (.aco) or Save Swatches for Exchange (.ase). Although Photoshop can load both files, the Exchangeable Swatches feature allows you to save your swatches from Photoshop in a format that can then be loaded into Illustrator and InDesign.
Many of you already probably know that both saved swatches files can be loaded via the Swatches fly-out menu however it’s not widely knows that they can also placed in the Photoshop swatches folder (Adobe Photoshop > Presets > Color Swatches) so that they will appear automatically from the Swatches panel’s drop down menu.
March 5, 2010
If you choose to view your swatches (or styles) as a list, you can double click on the name of the swatch to rename it (this is true for any panel that displays it’s items as lists (Actions, Layer Comps etc.).
March 4, 2010
Instead of navigating the panel menus, Control (Mac)/right mouse (Win) -click in the Swatches panel (over any of the swatches) and choose to Create New Swatch, Rename a Swatch or Delete a Swatch. Note: this shortcut also works with the Styles panel. In addition, clicking in a blank are of the Swatches/Styles panel will create a new swatch/style.
March 3, 2010
Option (Mac) / Alt (Win) -click on a color swatch to delete it in the Swatches panel. Note: this shortcut also works on the Styles panel and in the Preset Manager (Edit > Preset Manager). The advantage to using the Preset Manager is that you can click on one swatch, then Shift-click another to select multiple contiguous swatches (or Styles, Brushes etc.) and delete them all at once. In addition, the Preset Manager enables drag-reordering items which is not possible in the individual panels.