Now Supports Sending via New ReTweet Function
Sending ReTweets is now supported by both the new and old methods. Either send the ReTweet without editing (the new method), or edit the Tweet and then send it (the old method).
Support for displaying ReTweets sent to you is still being worked on. It seems to be very API intensive which is a downside of the system.
Profile Images
Clicking on profile photos/avatars will now display the users original source image as a pop-up layer.
Note not everyone has a larger image to display, so it can sometimes show just the small source image.
Conversations
A new feature has been added.
When a Tweet is posted that is in response to someone else's Tweet, then you can click on the link presented to see the conversation as it evolved.
At the moment, limited to the latest five messages in the conversation, although I expect to modify that once I am confident it isn't causing any problems.
Note, it only tracks messages where someone has deliberately clicked Twitter's "reply to" button. If you just type @username as a completely new Tweet, then that won't be picked up as Twitter will presume it is a new conversation and not related to any previous messages.
Saving your Personalised Layout
If you have a lot of lists open at the same time and spend a bit of effort in laying them out exactly as you like, it can be a pain to have to do that each time you log-in.
Now you can save the layout and it will reused each time you log in.
There is a "save layout" link at the top of the page - each time you click it the layout at that moment will be saved.