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I've been banging my head about this, and have created a work around, but it would be much nicer for my site's organisation if I could figure this out:

I want to be able to query posts across two taxonomies (one of which is custom), I'd like to be able to do this automagically, without needing to create custom templates with custom DB queries.

I want to have a 'platform' taxonomy, and be able to label articles in normal taxonomies (such as 'review' or 'preview')

At the moment I use a customised Walker to allow me to use the built in Menu system to generate menu's that point to specific archive pages.

My url looks like:

domain.com/category/platforms/consoles-platforms/ps3+review/

Which finds articles that are in the PS3 portion of platforms AND in the 'Review' category. Currently this is all done under the normal wordpress 'category' taxonomy.

Ideally I'd want them to be separate taxonomies, ('Reviews' being part of normal 'Category' tax and then a 'Platform' tax for console organisation) so that the URL could look like:

domain.com/platforms/consoles/ps3/review

It looks nicer and would let me keep my categories more tightly organised. BUT i can't for the life of me see how you set up wordpress to query across two taxonomies automatically.

Has anyone else come up against this?

Edit: Following Rarst's comment, I have to wonder, am I being too ambitious with my URL requirement? I could feasibly set this up using GET parameters and just one template (ie, domain.com?platform=ps3&type=review); is that the simplest/most robust way? Any other ideas on how to solve this?

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I think you might want to rephrase title and question a bit. Querying itself is trivial or easy (mostly... :) but what you want is complex URL structure, which is entirely different story. – Rarst♦ Jan 11 '12 at 11:11
I've edited the question some, and realise I could do it with GET variable, although I would rather a nice URL structure if possible. Or rather: if there is a simple Wordpress way to query across taxonomies, that would be a good thing to know. Thanks Rarst! – josh Jan 11 '12 at 17:29
There are probably ways to do this with the wordpress rewrite engine, but I'm not an expert in that. I know buddypress accomplishes something similar, however it's not simple. Try downloading buddypress then look in buddypress/bp-core/bp-core-catchuri.php, you will see how they explode the url into it's component parts, then from there you can find out what should be loaded and hook into the wp template loader. – Deryk Wenaus Jan 12 '12 at 7:31

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