excellent review flitefone
BOU-PAX, I think your list is pretty smart; I would have thought those in Ryanair would look at Bergerac as a no-brainer (especially since Flybe have just announced increased frequency on their route) along with Belfast City and possibly Paris Beauvais. I also think Venice and Rome should be on Ryanair's radar.
I think routes like Manchester might not be so sensible but could work for a different type of carrier, possibly Air Southwest. Newcastle could also be good for Air Southwest.
Brussels and Dusseldorf (in my opinion) will never work from Bouornemouth. It's market is inherently leisure based and far more difficult to achieve desired yeilds from BOH on more business traffic services. Look how BRU has suffered from SOU, only now just picking up. DUS at SOU doesn't seem to be working either with a massiv fall in pax in Jan 08 compared to Jan 07.