
What we are probably seeing is a beta of Microsoft' s search product, followed by backfill from Inktomi (this is why the search counts differ).
This only seems to happen on "popular" search queries, like open source (74 msn, 8,013,904 backfill, 11,700,000 google), and baseball (1974 msn, , 20,500,000 google), and linux (365 msn, 16,291,540 backfill, 92,000,000 google). "Unpopular" terms like wax museum just get backfill (151,414 msn backfill, 282,000 google). By only appearing on select popular terms it gives them a chance to test their product on search queries that an immature search product is likely to have results on (or maybe all search queries go through this new search first, and terms like wax museum just don't have any hits yet forcing the backfill to page one).
However, you assertion that the author has no idea how MSN Search works is probably spot on (both the submitter to Slashdot and the referenced author). Whatever Microsoft's feelings are about open source solutions, they're smart enough to know that surpressing information in the free portion of search is a PR disaster waiting to happen.
If entropy is increasing, where is it coming from?