Here are the experiences I'd like to share:
(1) ExpertFlyer has fixed the problem of showing incorrect CZ award availability. We can now rely on EF to find CZ award availability, which is excellent. One thing to keep in mind is that the on time rate of CAN-LAX flight is horrible, and it is not at all uncommon that this flight arrives 2 hours late (because it needs to be parked at LAX for several hours anyway). Be careful to plan the connections.
(2) KE's LAX-NRT and NRT-LAX flights almost always have 1 J award available. It is also fairly easy to find 1 J award on LAX-ICN-LAX, SEA-ICN-SEA and YVR-ICN-YVR, but 2 seats on the same flight is most impossible to snag.
(3) AS has excellent award availability. If you live in the west, always try searching DL's TPAC and TATL flights from SEA or PDX. If it is available, then you can easily add an AS flight to/from SEA or PDX. Such routing (such as PHX-SEA-AMS-ZRH) will usually not automatically be shown if you only search the departure and arrival airports (e.g. PHX-ZRH). So, do a multi-city search.
(4) The following TATL flights have good availability: ORD-AMS/CDG, JFK-AMS/CDG, IAD-AMS/CDG, DFW-AMS, IAH-AMS/CDG, BOS-CDG. If you can find low award to these US gateway cities, you'll have a good shot at TATL awards. These routings will usually not shown automatically so do a multi-city search.
(5) Award availability on AZ can be seen on airfrance.us, but not delta.com. Sign up for a FB account and do a search there.
(6) Award availability on DL/AF/KL metal within a month changes very frequently. If you are searching for an award within a month, search at least 3 times a day.
(7) Don't forget OK. You can fly DL's ATL-PRG and JFK-PRG and connect to OK flights there. OK award availability can be seen on EF.
(8) The new SEA-KIX flight can be taken advantage of. CZ, MU and KE offers a decent number of destinations from KIX.