Here it is, RIM's response to the iPad, the Blackberry Playbook. Main differences I can tell from this video are the true multitasking interface, and flash support (or how they call it, "uncompromised browsing").
Note, it will be only available in "early 2011", so it will compete not with the present iPad, but most probably with the 2nd generation iPad. Prices are still not available.
Update: a nice comparison between the new Blackberry's Playbook, Apple's iPad, Samsung's Galaxy Tab and Dell's Streak.
RSS readers may need to visit the blog to see the video.