Most of the guidebooks and recommendations for Copenhagen seem to suggest taking a canal boat trip, using one of the commercial canal tour companies. However, these tours look a little pricey, and today at least seemed to have some long queues...
Elsewhere hidden away in the guidebook I also discovered the Havnebus 991/992 ferry route (route 991 southbound, 992 northbound). This is covered on the regular Copenhagen public transport ticket scheme, including being covered by a 24 or 72 hour city pass.
The Havnebus route seems to cover many of the highlights of the commercial canal tours, including going to near the Little Mermaid statue, passing the Opera House and Nyhaven, along with the new Det Kongelige Bibliotek building.
If you already have a suitable ticket, can you use the Havnebus to largely recreate the commerical canal tours on the cheap, or is there something big you miss out on if you do?