Skildring
This plugin lets you do faceted search using multiple custom taxonomies.
It has a drill-down widget with multiple display modes.
Said widget is easily customizable via template files (no PHP knowledge required).
Sponsors
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I do not offer any support for this plugin (free or paid).
Please consider using an alternative plugin.
Links: Documentation | Plugin News | Author’s Site
Skjermbilete
Lists mode 
Checkboxes mode 
Dropdowns mode 
Widget configuration
Bidragsytarar og utviklarar
“Query Multiple Taxonomies” is open source software. The following people have contributed to this plugin.
Contributors
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Endringslogg
1.6.3
- fixed parent term post count. props wxyjp
- fixed term name enconding issue
1.6.2
- {{count}} tag improvements. props tiagoalves83 and jprberlin
- added {{any-text}} tag. props jprberlin
- updated to Mustache 1.0.0
1.6.1
- fixed activation error
- fixed error in PHP 5.4
1.6
- added checkbox mode
- added {{count}} tag. props khakulov
- added Ukranian translation. props Jurko Chervony
- more info
1.5.1
- fixed issue with custom post types
1.5
- easy customization, using Mustache templates
- bring back wp_title filtering
- fix qmt_get_query() not working with the «AND» tax_query operator
- more info
1.4
- WordPress 3.1 compatibility (native taxonomy handling)
- sortable taxonomy list
- widget not affected by non-active taxonomies anymore
- dropdowns display hierarchical taxonomies correctly
- more info
1.3.2
- fixed URL problems
1.3.1
- dropdowns displays hierarchical taxonomies correctly
- various bugfixes
1.3
- multiple taxonomies per widget
- introduced dropdowns mode
- is_multitax() accepts a list of taxonomies to check
- fixed a lot of query errors
- more info
1.2.3
- fixed problems with custom menus
- fixed a problem with categories
1.2.2
- fixed fatal error
- reverted is_multitax() to previous behaviour
1.2.1
- fixed issue when site url isn’t the same as the wp url
- fixed issue when doing a single taxonomy query
1.2
- fewer queries
- custom post type support
- load correct template for single category|tag|term archives
- more info
1.1.1
- better title generation
- add ro_RO l10n
1.1
- allow ?tax=foo+bar (AND) queries
- add taxonomy drill-down widget
- more info
1.0
- initial release
- more info