I am still interested in this and still hope for more information from someone who has done it. It is easy to find a shipping company with a search, hard to know if people have good experiences with them.
I looked for Bike Flight, all I find is www.bikeflights.com/ which deals with bicycles not motorcycles.
I just looked at Citizenshipper, it is a bid aggregator. Submit a pickup and dropoff location, and then you get a bunch of quotes from whomever. In two hours I got four quotes and one request for more detail on my scheduling flexibility (all I am doing is hypotheticals, I can't be specific on shcedule). Not quite what I was hoping for (maybe it has changed in 3.5 years).
Anyone use a specific company and have a good result?