In a rather impressive debut, Firefox Mobile, which has not even entered alpha release yet, already scored 88/100 in the Acid 3 web-standards test (wikipedia). This test measures how standards compliant a web browser’s rendering engine is, and therefore how accurately it will be able to display complex web pages.
For comparison, the iPhone 3G browser only scores 74, wile making a complete hash of the rendering of the test, and the Opera Mobile 9.5 browser scores a lower 71 (but however renders the web page much more accurately than the iPhone browser).
With results this good, and also reports that browsing is pretty past, I cant wait for this new entrant to arrive in the now-crowded Windows Mobile browser arena.