Sliding Keyboard updated for WP7, but may not be worth the time
Like any other gesture keyboard, Sliding Keyboard allows you to swipe from one letter to the next rather than typing. For shorter words, it may not always be faster, but for longer words, gesture keyboards make phones much more useful. Sliding Keyboard is a standalone app, because WP7 doesn't support alternate keyboards. That means you'll have to rely on copy/paste to get your text from the Sliding Keyboard app for most things, although the app does integrate SMS, e-mail, and Bing search, which helps immensely. The app also supports 9 languages: English (US & UK), Catalan, French, German, Italian, Spanish, Hungarian, and Polish.
All of that sounds great, but as you'll see in the video, there is a reason why the app has garnered mostly bad reviews. There is a notable delay after finishing a gesture before the word suggestions pop up, and the auto-suggest clearly needs more work.
Sliding Keyboard is available in the Marketplace for 99 cents.