It is Shadows Over Baker Street: New Tales of Terror! (http://www.amazon.com/exec/obidos/tg/detail/-/0345452739/qid=1126130489/sr=2-1/ref=pd_bbs_b_2_1/002-9751280-1690410?v=glance&s=books), edited by Michael Reaves and John Pelan, and it contains 18 new SH x HPL FF stories by assorted professional fiction writers. "Study in Emerald" was written for this compilation.

I'm a huge foaming monster from beyond the stars

Cthulhu? Is that you, honey?

*hides*