Recently, a question came up on the KDE Community Forums regarding the use of multiple Google Calendars with KOrganizer. The preferred access up to now has been with googledata Akonadi resource, however that doesn’t support more than one calendar, and (at least from my unscientific observation) seems to be rather unmaintained these days.
Luckily, not all’s lost. Akonadi recently gained the opportunity of accessing CalDAV resources, and Google Calendar also offers a CalDAV interface, hence this is possible.
This post will briefly describe how (thanks go to PIMster krop, which casually mentioned the possibility on IRC and prompted me to investigate).