Windows Mobile: Opera's released an early, partially-featured beta of its Mobile browser that brings the server-side browsing speed-ups of Opera Turbo to touchscreen phones.
Our phone-happy compatriots at Gizmodo give the Turbo feature of Opera Mobile 9.7 Beta a qualified thumbs up, noting that it brings considerable reduction to web page load speeds with "not that bad" image compression. Still, while Turbo is on, the browser itself gets a bit flakier. Opera itself notes in release notes that downloads just won't work with Turbo enabled, and fans of Opera's Widgets have to turn off Turbo when switching over to them.
Google Gears functionality and full Flash support aren't in this beta either, but are expected. You can check out what's already happening in Opera Mobile in this explainer video:
Opera Mobile is a free download for Windows Mobile 5/6 phones powered by touch screens. Be sure to read the release notes at the link below, as keyboard input and other issues have been noted with certain phones.