When it comes to smartphones and tablets, mobile apps get all the glory. But they also eat up storage space on your mobile device, and they often cost money. And if you decide you need an app while you're away from the cozy confines of a Wi-Fi hotspot, they can be difficult, if not impossible, to download.
Luckily, though, apps aren't your only option when it comes to accessing and experiencing excellent Web content on your mobile device: Plenty of mobile sites, services, and Web apps can do that, too. Thanks to the widespread use of smartphones and tablets and the rise of HTML 5--the Web standard that brings enhanced usability and rich media to handheld devices--mobile sites are better than ever. Here are 20 that you should check out now. (Most will work with an Android or iOS device, but a few are platform-specific.)