Nice, but ultimately useless as it does not reproduce iSafari selective font resizing (for h1/h2/h3) that tends to screw up a lot of websites.

(edit) On a more general note, emulating behavior of a browser/OS combo is not a very good idea as it is trivial to miss quirks that need emulating. It should really be taking an actual browser screenshot on selected device, but then it would've not been different from a ton of similar services... which arguably sprung up because they are doing things rifht and therefore are useful.

...which services are doing it right? Got a list?

Adobe's BrowserLab does this (https://browserlab.adobe.com/) for mainstream Mac/Windows browsers. You need an AdobeID (registration is free). I've found it much faster than browsershots.org (though you have fewer options). No mobile support, I'm hoping they add that soon.

Edit: 'no mobile support' = 'doesn't emulate mobile browsers'

http://browsershots.org is one and they also have $ version that is allegedly better and faster.

For browser-based website monitoring the best ones are AlertFox and Browsermob

I make mobile websites and this is the best emulator I know of to test them for an iPhone or iPad. It runs on the desktop and is pretty slick. http://www.puresimstudios.com/ibbdemo/

Not very useful as it doesn't seem to be modifying the user agent string sent to the server, only resizing the containing div.

Did you test this? It indeed changes the UserAgent in my test: Ipad setting sends "Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5" for example.

I'm trying to debug an iPhone browser freezing issue with one of my sites, but this doesn't reproduce the issues. That would be really useful. As an aside does anyone know of a good way to debug this? I would kill for an iPhone version of Firebug right now...

I suppose this is useful for testing basic layout without mucking with your UserAgent, though.

It's a cool site, but it doesn't seem to be supporting canvas yet. And yes, my browser(Chrome 12) does support it.

when I tried with twitter.com on mobile device, entire page got redirected to the twitter website

Fairly cool, but noticed it doesn't seem to be supporting @font-face CSS directives.

It'll support whatever the browser you're using supports.

doesn't pull and display css

Are the images turned off by default? I can't seem to load any images.