I was just thinking about this thread yesterday as I was organizing my daylily seeds. Last year I selfed a couple. So far, I have come across atleast two that produced seeds that appear (look good and pass the squish test) to have viable seeds, but whether they produce viable seedlings is another matter. The two varieties I know I have 'successful' seeds from are:
Olallie Keith (dip)
Sound and Fury (tet)
I didn't get very many seeds out of either. I don't usually expect many seeds out of tets to begin with, but Olallie Keith typically gives off a number of seeds in its pods, so the low number would seem to indicate that the genetics of some of the seeds caused them to self abort. That's just a guess, of course.
If I come across others that were 'successfully' selfed, I will try to remember to come back in here and post them. Moreso, if I plant these this year (I wasn't really intending to due to lack of space), I will report back on how viable the seedlings were.