The Google Play Store features several scrollable tabs - categories, featured, top paid, top free, top grossing, top new paid, top new free and trending. Apps usually have several screenshots (some even offer a demo video) so you can get an idea of what the app looks like before installing it. You can also check out comments and ratings, as well as the number of downloads and so on, to help you decide if the app is worth it.
There are all kinds of apps in the Android market and the most important ones are covered (file managers, navigation apps, document readers etc.).
Not quite an app store, the HTC Hub is a good source of wallpapers and sound customizations - ringtones, alarms and notification sounds and entire sound sets (a set is a whole package that brings together the other three categories).
There is also a handful of apps, as well as customizations for skins and entire scenes as well.
The HTC Desire X has a built-in GPS receiver, which managed to get a lock in under a minute (with A-GPS switched off). If all you need is a rough idea of where you are (within 150 meters) you can use the Cell-ID and Wi-Fi network lock, which is very fast.
At this point, Google Maps is a standard part of the Android package and we've covered it many times before. It offers voice-guided navigation in certain countries and falls back to a list of instructions elsewhere. You can plan routes, search for nearby POI and go into the always cool Street View.