Ergonis Software has released PopChar X 6.5 with a new custom insertion technique, which should make it faster to insert characters in applications that don’t reliably support direct event-based insertion of characters. The update also provides a workaround for a problem that caused the search field to be cleared while entering search terms on OS X 10.9 Mavericks, squashes a bug on non-English systems that prevented PopChar from remembering the previously selected layout, and improves the speed of clipboard-based insertions for many applications. (€29.99 new with a 25 percent discount for TidBITS members, free update, 3.7 MB, release notes)
Disable Caps Lock
If you find yourself pressing the Caps Lock key accidentally as much as I do, note that you can disable it entirely in Mac OS X. Open the Keyboard & Mouse preference pane, click the Modifier Keys button, and in the dialog that appears, select No Action from the Caps Lock pop-up menu. You could remap it to another modifier instead, but that might make using differently configured Macs more difficult.