Data.gov hosts 272,677 datasets.
LinkingOpenData will point you to a 400 subset that is available as “Linked Data.”
I guess that means that the other 272,277 datasets are not “Linked Data.”
Fertile ground for topic maps.
Topic Maps don’t limit users to “[u]se URIs as names for things.” (Linked Data)
A topic map can use the identifiers that are in place in one or more of the 272,277 datasets and create mappings to one or more of the 400 datasets in “Linked Data.”
Without creating “Linked Data” or the overhead of the “303 Cloud.”
Which datasets look the most promising to you?