>do they allow webmasters to submit hundreds of pages from one domain name (assuming that the keywords and titles are all different and are factual)
Yes, NBCi's LiveDirectory allows deep-linking. I submitted about 4,000 pages built on a template, but each with unique content. (I did email the editors first, because of the quantity involved.) Remember, the LiveDirectory is a popularity contest, the most-clicked rise to the top for that term, THEN the editor (and/or an algo, perhaps) chooses whether or not to promote them up to the reviewed level -so it's very worthwhile to spend some time optimizing prior to submitting.