One of the features I find most exciting at the latest RCSB PDB web site release is "faceted browsing". Similar to an online shopping site, which allows to drill down through product categories, it is now possible to drill down through lists of protein structures using categories like Resolution, Organism, Polymer Type, to name just a few of them.
You can easily start browsing by clicking the total number of structures on top of every page. Since this features has become available (Thanks Dimitris!) I have observed myself to use it all the time and I perform much fewer "advanced queries", because this new feature is so easy and quick to use. Let us know if you want to have additional categories.