* New notification system - Gone is the plain old window, fixed in the top-right corner. Now TweetDeck will show a cool new notification window, with previews of the latest tweets, and the ability to take the standard actions directly from the preview. No more having to open up the screen to reply to a new tweet - now you can reply, retweet and more, all from the popup notification. Plus, you can configure the location of the popup AND set options on a column-by-column basis
* Keyboard shortcuts - Navigate around your Tweetdeck rows and columns using the keyboard. Hit Space to open the new HUD menu and access common actions quickly without taking your fingers off the keyboard
* New Followers column - You can now add a column to your TweetDeck that shows your most recent 100 new followers. You can follow, unfollow, block, report spam and even add to a group direct from this column
* Many fixes, including: Missing spellcheck, "@@" problem for Linux users on Autocomplete, Posting FB status updates with links, Unable to post >140 characters, Auto-shorten URL problems with some links

MySpace,
Updated Facebook,
TweetDeck Directory

A minor update to fix the following specific issues that have been causing trouble just recently:

"Not Authorised"
This issue manifested itself when someone had changed their Twitter password, resulting in a "Not Authorised" status. When trying to change your Twitter password you may also have received a "Wrong details" error.

"Blank Tweetdeck"
This issue, documented here http://bit.ly/tdblank manifested itself in a totally blank TweetDeck screen.

"Missing tweets while updating"
We identified a situation that could arise where by tweets would be lost if they arrived in a column while TweetDeck was in the process of sending an outbound update.

TweetDeck v0.21b includes the following updates:

Added spell checker

Added sent DMs to DM column

Added "narrow columns" preference

Added confirm box when closing a column

Added TweetShrink functionality to tweet panel

Fixed bug with missing tweets from All Tweets feed in between your own posts

Fixed #searches not updating properly

Updated interface to make it slimmer, reduced some UI spacing

Added tweet actions now cause tweet to be marked as seen

Added logic to auto-add http:// where necessary to urls to be shortened

Added double-check so reply column tweet must contain @username

Added "unknow" message to profiles where returned data is incomplete

Updated "mark as read" to "mark as seen"

Updated saving of window size & position and url shortener code

Updated logout button location

Updated "All Tweets" to more accurate "All Friends" column name

Updated 12seconds video to be more in line with tweet UI

Fixed hanging when deleting tweet

Fixed bug so edited group names update straight away

Fixed hanging when marking as read

Fixed bug where a cleared column now updates with just new tweets

Fixed bug with DM counter

Removed auto-update of favorites column

Removed cross column marking as read - performance issue, temporary measure

Removed cross column deleting - performance issue, temporary measure