With Windows 7 gearing towards the RC release in April 10, WinFuture has posted some screenshots of the latest Windows 7 build 7048 which it mentions to be available only to Microsoft Partners and select internal testers. According to WinFuture, the build was compiled at 18:45 hours on 19th February as inferred from the build string - 7048.0.winmain.090219-1845
WinFutures screenshots highlights some of the changes mentioned by Microsoft to be done in Windows 7 RC.
Start button glows more strongly when clicked
New icons for Notes, Paint and Calculator applications
ALT + TAB with Aero Peek
On 20th of February, Sinofsky mentioned that build 7046 was still in progress which is contrary to the date mentioned (for this 7048 build) in the WinFuture and we also had a Microsoft employees tweet on 25th Feb regarding upgrading the system to build 7047.
Considering these dates (if they are indeed correct), Microsoft seems to be progressing internally at a faster rate towards RC
More screenshots at WinFuture