Guess I stand apart from most of the crowd here, who seem to be utterly, well... hipnotized by BB
BB is a great and innovative resource, to be sure. My hat off to them. This said, their mysterious (not to say suspect), far from transparent domain acceptance algorithms and inflexible terms and policies make them a useful marketing tool, but not a partner you can rely exclusively on. General purpose marketplaces like Afternic or Sedo apart, there are a few other specialized, brandable-centric marketplaces you should apply to as a matter of course and compare results. In no particular order: Namerific, BrandDo, BrandRoot... have I missed anything?
They should all be part of your domain marketing strategy. However, the most important brandable marketplace should always be...
your own marketplace! Okay, tools for this are lacking at present, but this will change before this year's end