Looks good. I like that filtering tool you have. I noticed a bit of a bug with it though. If you use the "-" to delete filters and you delete the filter when there is only one filter, then you lose the ability to see the "+" to add filters. I had to go to another accordion module and come back again to be able to reset it to show the "+" again.
A minor remark about the styling. The top portion is loaded up with toolbars. I can see where a user kind of gets lost in them, not realizing where one starts/finishes. Take the filter tool for example. I could see some benefit in altering the css slightly to distinguish the levels of toolbars or panels up there a tad. I'm not saying to make it purple as a total contrast, but something slightly different to give a visual cue.
What do you mean with proprietary? I'm a little bit confused as we don't have any proprietary code.
Sorry, I didn't imply you. I meant what I linked to, plus your cautions about how part of the package wasn't included for US users because of patent rights, etc. I think the linked package has something of their own proprietary system, and on the wiki for that link mention how Apple, etc. has propietary stuff. So again, I wasn't implying you had something proprietary.