SPS V2: Looking for suggestions on the best way to secure at the
document level. We are publishing catalogs, for example,
some of which have prices and some of which do not. We
want to secure those that have prices to a select set of
users. Since the documents are basically the same, we'd
like to have them in the same document library. Is there
a way to secure the documents with prices in this library?

If they have to be in separate document libraries, then I
understand that the only way to secure a library is to add
it to a top-level site under the portal. How, then, can
we provide a unified view of the price and non-price
document libraries?