Android: The keyboard in Android 2.3 is one of its best new features, and if you're itching to try it out right now, you can download and install it on your rooted Android phone.
The keyboard is certainly an improvement over the stock Android keyboard, with better targeting, better auto-correct, and easier number and symbol typing. The download is just a simple .zip file that you flash to your phone just like you would a ROM, theme or kernel (which you can do either through ROM Manager or through your recovery image). Make sure you back up before you install it in case it causes any problems on your phone. Hit the link for more detailed instructions and to download the keyboard.
The Gingerbread keyboard is a free download for rooted Android devices running a 2.2-based ROM. Droid 2 and Droid X users, make sure to take note of the extra step mentioned on Droid-Life before proceeding.
Download: Gingerbread Keyboard For Rooted Devices [Droid-Life via Talk Android]