By now if you haven't seen our Streetfilm "Groningen: The World's Cycling City" you should check it out. Like, now! It has broken every single Streetfilms viewing record - it had nearly 40,000 plays in just its first week!
One of the folks you'll see featured in that video is David Hembrow who has been reporting on cycling in the Netherlands for many years via one of the smartest transportation blogs out there "A View from the Cycle path". It's full of great knowledge you will want to devour. He also leads group bike tours of many cities in the Netherlands.
I was very fortunate to get to spend some time with him and we got along famously. Above is a video with some anecdotes and biking montages during our 20 mile bike journey from Assen to Groningen. It's only a small taste of what you'll experience in the Netherlands, but I think it will leave you craving more.
He currently has up a blog post full of all sorts of references and links to other posts that will give you a wealth of information about Groningen. Good stuff!