Flickr has announced expanded mobile support, including mobile viewing of Flickr videos:

Today we’re releasing several upgrades to m.flickr.com. If you’ve got a smartphone with one of the fancier new mobile browsers, you’ll experience a completely new version of our mobile site, one that’s built around the things that are most important to you when you’re on the go.

First, the sexy part — you can now view Flickr videos on your mobile phone! Videos uploaded from today forward will be immediately viewable through our mobile site. As of today this particular feature is available to iPhone and iPod Touch users only, but we expect to rapidly expand the number of devices that we support.

The activity stream now has more information in it, all synched to the settings you specify on the main Flickr site. For the first time you can now comment on, and favorite, photos from your mobile phone. And it’s also wonderfully simple to add, find, and manage your contacts.

Emailing photos from your mobile phone to Flickr also gets a little easier. We’ve made your secret Flickr upload email address a cinch to find and use. Just enter it in your address book under the name “Flickr”, then email us whenever you shoot something interesting.

Finally, if nothing’s happening in your part of the Flickrverse, we’ve made it very easy to browse the most interesting photos of the day, or do a search of the 3 billion+ photos that live on Flickr.

In other words – if you got an iPhone, Flickr is getting a lot cooler. The updated Flickr mobile site loads quickly and is easy to navigate on the iPhone, with navigation limited to most frequently used items.

Here’s Flickr’s official word on the phones supported by m.flickr.com:

m.flickr.com works on just about every device that has a web browser and an internet connection. If your device has an advanced browser (currently the Apple iPhone/iPod Touch, GPhone, or any device using Opera Mobile, Firefox Mobile (Fennec), or other WebKit browser), you get an extra fancy experience that takes advantage of some of your browser’s exciting features.

Video playback is currently limited to the Apple iPhone/iPod Touch, but support for more devices will follow as soon as possible.