Seems to be alternating between "Long poll received" and "New block detected" messages now; first the poll message, then the other, sometimes with a second or less between the messages. Here's a sample:
[2011-07-10 08:24:28] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:24:30] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 08:27:23] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:27:36] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 08:32:39] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:32:54] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 08:38:41] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:39:16] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 08:47:03] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:47:04] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 08:56:18] LONGPOLL received - new block detected and work flushed already
[2011-07-10 08:56:19] New block detected, possible missed longpoll, flushing work queue
[Accepted] [CPU 0] [0.9 Mh/s] [Q:530 A:4 R:3 HW:0 E:1% U:0.01/m]
[2011-07-10 09:36:24] LONGPOLL received - new block detected and work flushed already
[2011-07-10 09:36:51] New block detected, possible missed longpoll, flushing work queue
[2011-07-10 09:50:50] LONGPOLL received - new block detected and work flushed already
[2011-07-10 10:10:05] New block detected, possible missed longpoll, flushing work queue
I'm on commit 4bb13bda68fca91a8f96ec3c17cf6f99ecf70342
Edit: before 6:46 I was only getting this message: "LONGPOLL detected new block, flushing work queue", now I'm not getting it at all.