[Painbird]

http://purifytheme.tumblr.com/

Uses the jQuery Isotope plugin: http://isotope.metafizzy.co/ for the responsive grid layout and for content filtering.

Video demo: http://purifytheme.tumblr.com/post/7801430330/purify-theme-d...

[Dramatize]

Nice, I really like it.

Think I'll use it for http://blog.rumplo.com & http://motherandcub.com