Ever wonder how far ahead of publication authors sometimes run? I just turned in the second book for the Shadow Grail series.... and I bet you guys don't have the first one yet :-)
Many were asking about Diana Tregarde - that's going to be in Trio of Sorcery, with Ellen and Jenny. Now working on the next Elemental Masters book Unnatural Issue.
Ms Lackey's bibliography (by publish year) is here. As always, you can purchase her books via Firebird Arts and Music.