We've re-organized the blogs.oracle.com homepage by topic area. You like?
It was just becoming too difficult to wade through all the item-by-item descriptions (most of which were repetitive). You'll also note an expanded aggregator.
IMO it's an improvement, but if I get enough screaming and yelling for a rollback, that's fine too.
Of course, OTN Semantic Web Beta is still the best way to navigate the blogosphere, even if it does aggregate only a subset of these blogs.