Some of these are more than likely known to people, but i though i would add them here. Partially for you and partially for me!
Command Line stuff
birdc show route for 220.127.116.11 shows all routes known for that ip address
birdc show route protocol INTERNAL_LON1 shows all routes for a given Peer.
birdc show route where bgp_path ~ [= * 15133 * =] show routes where AS15133 is in the path list.
birdc show route where bgp_path.last = 15133 show routes where AS15133 is the LAST path.