I have an xtracycle and it is super-duper. But it is on my commuting bike not on my road bike. Whilst I think that they can fit most bikes, they seem to work much better with the Surly Karate Monkey (which is what the DH and I both have). Xtracycles are great, but in the price range on $500. They are great for load carrying capacity (up to 200 lbs.) and even have attachments that allow you to cycle along with large items like surfboards, or your spare bike.

As for my brazeon idea...the DH says that you could probably find someone to weld them on (a local framebuilder?) but that panniers wouldn't work so well with the geometry of a road bike. He suggests getting the Topeak rack from REI which uses the rear hub scewer to attach to instead of brazeons. This would definately be the cheaper option than the xtracycle.

The DH says that the BOB is the least intrusive option and would be a nicer ride than carrying weight on the bike. But he adds whilst they are rated to 70lbs., "pack light".