If all those services provide JSON blobs, that's halfway to making an RSS feed of them or building a custom search interface or what have you. The other half is

If all those services provide JSON blobs, that's halfway to making an RSS feed of them or building a custom search interface or what have you. The other half is standardizing common field names (so you don't have the same field named "created" or "published" or "date" depending on the source); Dublin Core and the like take care of that.