I've seen this in the marketplace...

http://www.renderosity.com/mod/bcs/modelling-for-poser/82834

Doesn't mention anything about UVLayout, though.

There's also Fugazi1968's digital tailor series of video tutorials...

http://www.renderosity.com/mod/bcs/index.php?vendor=258278

Ummm, Yanelis3D has a tutorial on poserpedia about using UVLayout to map clothing...

http://www.poserpedia.com/index.php?title=UV_Layout:_UV_Mapping_Clothing

...and apparently there are video tutorials @ http://www.uvlayout.com/