I can’t find any new feature from IE8 RC 1.
but what change from IE8 RC1 to IE8 RTM is about bug fixing
Acid 2 test : Big Success

ACID 3 test : still Fail
Webkit javascript test : 8122ms (Chome 2 get about 3000 ms)
looking forward for IE8 SP1 or IE 9
-- edit --
I found that IE8 having Tabs restore feature :
download it at :
http://www.microsoft.com/windows/internet-explorer/worldwide-sites.aspx
See you next Deculture – S.A.