Here's a roundup of all the changes we've noticed between Windows 7 build 7000 and Windows 7 build 7048. Screenshots included. March 9, 2009 6:50 PM CT
This is a fairly sizeable writeup with lots of pictures, so I think it adviseable to follow the link below and read the article yourself.
http://arstechnica.com/microsoft/news/2009/03/side-by-side-changes-from-windows-7-beta-to-build-7048.ars
happy reading
javajolt