Since you probably already know I’m a tweep and that I am an ÜberTwitter advocate, I will cut right to the chase.  Beta-8 was recently upgraded, bringing about some minor bug and aesthetic fixes.  You are now able to not notify on new tweets and still receive notifications for your DMs, replies, and mentions.  To do this, go to your sound profiles, set ringtones/alerts. other and find the three ÜT options (new tweets, mentions, DMs) and modify the settings how you wish.  Also, the DMs and @ replies are no longer the solid greens and yellows they once were.  Now, they are both a gradient with their respective color on the outside fading into white in the center.

Both the bug fix and the aesthetic improvements are aces in my book.  The bug fix allows me to finally be notified when I receive a DM, reply, or mention.  The aesthetic improvement made it generally easier to read said DMs, et al.  To emphasize this, you must think that I am a relatively young guy with 20/20 vision.  If it helped me read that which was directed at me, those of you who wear glasses or have a visual impairment of some kind will find the aesthetic improvements invaluable.