Indeed, the image in question was produced in Poser - its V3 (my own custom morphs) and The Mansion, Great Room (available at Daz3d.com)
The image was a sort of promo for the Mansion's Great Room, a product I created with Darkworld way back in  2002.
The image is in the galleries at Renderosity. : www.renderosity.com/mod/gallery/index.php
 And yes, the image is heavily postworked in Photoshop and Painter, especially the clothing and hair, which are all post work. The basics - setting, furniture,figure, pose - are all created in Poser 4.
At the time Poser 5 came out, the company asked me for the use of some of my work - which was used in the Poser 5 manual. 
I signed a form which allowed them to use my work, however, I am none too thrilled about having done this noiw, especially considering my work is being used without attribution.
Note that I never was remunerated in any way for allowing them to use my artwork (unnatributed, too!). I never even got a copy of the software.
However, in all fairness, it isn't false to say the image was created with Poser. The "painterliness" was fully intentional on my part, and no amount of post-render can obviate the fact that real Poser products where used and Poser 4 was the program used to render them.
Moyra