Sheraldine is on Spcnet, I could've sworn that I've seen her post just last month if not more recent. But yes, her fanfics are amazing. Jenny Tran writes great fanfic too, but I don't think she visits Spcnet...or does she hmmm...
Some other posters I miss..I'm not a wuxia person, but I miss these people for their great discussion on series:
-Yon! Her website was great. And she's still like one of top posters even now (by her post count) but kinda disappeared
-the funny people for their comic relief, i.e. Mike Liu, The Janitor
Where did Yon go anyway?