The Htc Sensation offers a wealth of downloadable content thanks to features like Google Play (formally Android Market) contribution thousands of apps, and Htc Hub which lets you download widgets, skins, wallpapers etc. In this description I will look at the latter; both how to use it an what is ready for download.
On your Htc Sensation Xe homescreen, naturally tap the 'all apps' menu at the bottom left of the screen. You will then be presented with a list of all the apps which are currently installed on the phone. From here, uncover the Htc Hub app, and tap it to open. A menu will then appear, showing the categories of the ready downloadable content. These are as follows; apps, and plugins, widgets, sound sets, scenes, skins, wallpapers, ringtones, alarm sounds and announcement sounds.
Apps and Plugins
These are essentially apps which are similar found in Google Play, but are created by Htc and optimised for Htc phones rather than Android phones in general.

Widgets
These are like apps, but can be operated directly from the screen on which you wish to place them. This saves having to open them each time.
Sound Sets
These are sounds for features like alarms notifications, messages and emails. They are all based on a base theme, and there are currently colse to 30 to pick from.
Scenes
Scenes integrate wallpapers, lockscreens and app/widget configurations, which are all designed to complement each other. For example there is a vacation scene called 'Holiday Season', which has a dual clock (to display local and home country times) and come with camera and translator shortcuts on the lockscreen, so it is clearly aimed at those who are on holiday.
Wallpapers
This category offers a whole of wallpapers which are not included in the default set already found on the phone. Users can view thumbnails, and then pick to download and use the wallpapers. This means that there is less data filling up the phone's storage, and you only download the wallpapers after you have decided that you want it.
Ringtones
This category offer a option of downloadable polyphonic ringtones, and like wallpapers, allows you to hear a sample before committing them to your phone's storage, as they are all store on Htc's servers.
Alarm Sound and announcement Sounds are the final categories, which are pretty self explanatory. The attractiveness of using Htc Hub is that you can see/hear the products before you pick to download and use them. If you are not satisfied with the choices already included on your Htc Sensation Xe, you are sure to find something you like on the Htc Hub application. When downloading data from the Htc Hub, you can use a 3G or Wi-Fi connection, although Wi-Fi will be faster and will not incur data usage.
The Htc Sensation Xe is ready now from Uk networks, with a whole contribution the handset for free when you sign up to a selected contract.
Htc Hub Offers Downloadable article For Your Htc Sensation Xe