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Is there any resource recommendations in general for getting past the basics of QGIS and going into the deep dark secrets?

Specifically in relation to expression coding for labeling, queries, etc.

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Underdark has composed some nice examples for labeling expressions:

Easier Conditional Labels in QGIS

Here are some helpful links for querying:

Query Attributes

Working with Attribute Table - Basic Queries

If you are interested in coding then you can start with this resource:

pyQGIS Developer Cookbook

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Some useful stuff here for 1.8 and older

http://hub.qgis.org/projects/quantum-gis/wiki/How_do_I_do_that_in_QGIS

http://hub.qgis.org/wiki/quantum-gis/Calculating_field_values

http://hub.qgis.org/wiki/quantum-gis/List_of_Field_Calculator_Functions

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    Just note the list of Field Calculator Function is now out of date. All functions that can be used will be listed in the expression builder. – Nathan W Jan 8 '13 at 22:00
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a nice blog with good QGIS tutorials : http://woostuff.wordpress.com/

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