I have been checking every day. In fact, I've been checking 2-3 times everyday since mid-January. $79 each way is still the best I've seen for my dates in May. The day I found the $79 rate, it was $89 in the morning/afternoon, but switched to $79 in the evening and then back to $89 the next morning.
I noticed NWA tends to boost fares over the weekend, then back down on Monday.
I got 197 R/T for our May trip(5-8) on NWA in mid January.
Now starting to get ready to eyeball Thanksgiving 2007.