After using 1.3.3.0 for a few days I have to agree it's really fantastic. Much more stable and all downloads work really well now. I think this will be the release that makes me retire some of those other Gnutella peers.
Great work Swabby and team!
(I've had the same problem with the "failed" list though. I think the problem is it has no limits on how many items it keeps in memory and, if it builds up too many, it causes the list box to gag displaying them all.)