We're almost finished with a massive back-end upgrade to NB. Feel free to go over today [1] and kick the tires. Among the new features:

• Faster, more reliable
• Improved comments: even/odd coloring, up to 300 per page (existing users must change your setting to enable)
• Better RSS, now includes full text of articles and works in IE7
• More compatible HTML editor
• Pictures in your profile!
• Better search (still not satisfied)
• Need to rebuild your buddylist
• The end to automatic logout! Remember to logout when using a public computer though
• Printer friendly pages
• A new theme that resizes with your browser window

Post your feedback over here, though, since we're testing over the weekend and your comments will get erased.