iDevice File Locations (iOS 8)

Some locations have moved! Here's a updated list:

(work in progress)

Where are App Store applications installed?
All apps installed from the App Store are located in: /var/mobile/containers/bundle/application

Where are all my applications preferences saved?
Nearly all installed applications, including jailbroken apps from Cydia, save their preferences in /var/mobile/Library/Preferences. You can back this entire folder up if you need to re-install your iOS, re-jailbreak, re-install your Cydia applications, move your backed up preferences folder to your device and reboot. You then should have nearly everything back to the way it was.

Where are original iDevice wallpapers located?
The wallpapers that are included with your iDevice are not normally editable or delete-able. However, with iFile you can view them and delete them from: /var/stash/*/Wallpaper/iPhone** *this folder will change from one device to another. You'll have to click all the weird titled folders to see which one contains the "Wallpaper" folder. **obviously the last folder will differ depending on your device.

Where are my Camera Roll photos stored?
The name of the folders in which your photos are stored varies from device to device, but the location of these folders is always the same. Look in: /var/mobile/Media/DCIM and you'll notice folders with names like "101APPLE". These folders typically have all your camera roll photos.

Where are system sounds (such as power connected, email, tweets, etc.) located?
All system sounds are in /System/Library/Audio/UISounds. You can preview them with iFile, and change them around to your liking by swapping file names or import your own .caf files renamed to the specific sound you're replacing.

Where are Voicemail messages stored and can I do anything with them?
Voicemail is stored in: /var/mobile/Library/Voicemail. You can listen to them in iFile using it's audio player, or export them via email.

How can I export iFile bookmarks?
iFile bookmarks are located in: /var/mobile/Library/iFile, named appropriately "Bookmarks.plist". Just hit Edit and then select the plist, then email it to yourself from the bottom menu bar.