http://www.tellssoehne.ch     – I love love this!!!
http://dbfs.at                             – scroll is not too long and nav adapts to lower levels
http://kultstudio.com/              – very different, yet elegant UX as you get into different sections… check out “Framing” video in Framing
http://www.bluestepstudio.it  – very different UX that uses a left/right arrow slider interface with filling the entire screen…
I found it pretty intuitive, but probably not for the average joe?
http://www.mezzolab.com/     – super simple… terrible logo eh
http://whiteboard.is/                 – not wild about the video, but love the scroll and filling of the entire screen
https://snipcart.com/                – holy fuckin shit… wow!!!

Key gallery ideas out of the 50 or so sites I have studied the past few days:

http://www.artwalk.no/
Note: love the home page with scaling bg, but prefer white bg for entire site
http://www.artwalk.no/exhibitions/
really love BIG images and BIG titles with minimal type and lots of white space
http://www.ramisbarquet.com/
Note: not an awful “responsive” site design for mobile…just not great design like Paul Kasmin
http://www.paulkasmingallery.com/artists/walton-ford/2
Note: no go with serif type (gotta go sans serif), but love the spacing and image sizes
http://www.paulkasmingallery.com/exhibitions/2013-07-26_kenny-scharf-and-tseng-kwong-chi-at-eric-firestone-gallery

http://www.luhringaugustine.com/
Note: I like the rotating slideshow, but prefer a bigger slider and entire white background without the grey
http://www.miandn.com/
Note: nice bg image on homepage
http://www.miandn.com/artists/chris-johanson/works/1/
Note: again, big image, big title… better typography than Paul Kasmin
http://www.mnuchingallery.com/artists/jeff-koons
Note; superclean layout for reading… great spacing
http://www.matthewmarks.com/new-york/exhibitions/2013-07-12_roving-signs/installation-views/#
Note: love the installation views page…again prefer white bg