I am not sure exactly when this happened but I remember checking earlier in the week and Twitter was still sending me to the subpar mobile site. Brian let me know that Twitter is now forwarding BlackBerry PlayBook users to their HTML5 tablet site which is way more usable. I am absolutely loving it now and it sort of makes a PlayBook Twitter app semi redundant except for notifications. I will definitely be keeping an eye on this one.
Check it out on your PlayBook at www.twitter.com