The Penthouse Club is west of the Shamrock Horse Stables, redolent of horse manure and oats, beyond the ramshackle tire shops and automotive garages. It rises up on Eleventh Avenue like some set from "Bill and Ted's Excellent Adventure"—a steely Babel of boobs. Last night it was where Imogen Lloyd Webber decided to throw another book party for her debut effort, The Single Survival Girl's Guide. There were a lot of guys in suits there, a couple ladies in business attire and then a brigade of women in negligible negligees that, as the night wore on, wore off.