At work we've been using Haystack to manage our site search, with a Solr backend.
As usual, we're customising things quite a lot - using faceted queries and weighted indexes, and bypassing the built-in search forms - so I wanted to be sure, in line with my general obsession with query efficiency, that we weren't generating multiple Solr queries for every search.
Haystack does log queries for every request internally, but as far as I can tell there's no way of getting to that information without writing some custom code to import and expose the relevant variable. So I've written a (very basic) panel for the Django debug toolbar which does just that.
Just put this somewhere on your pythonpath or in your project, and add it to the
DEBUG_TOOLBAR_PANELS list in settings.py.