Firefox's mobile browser, Fennec, is available in "milestone" (read: very alpha) downloads for HTC Touch Pro phones, but also most any Windows Mobile phone running at VGA (480x640). Early reports say it's working, if slow.
As the Mozilla team itself notes, this release has plug-ins disabled, features no soft keyboard input, doesn't allow for program or add-on updating, and a few other "punts" made to get a working release out. Still, if you want to test out Fennec's unique navigation and mobile browsing helpers and you've got a Windows Mobile phone, it could be worth a try—even if web site loading is not exactly snappy at this point.
Fennec is a free download, built for the HTC Touch Pro but capable of running on Windows Mobile phones. A direct CAB link can be found right under the "Installation" heading in the link below.
