Congrats to my old team on shipping IE8. Although my IE focused days are behind me it's great to see the team has put out such a great version. The security improvements and commitment to web standards stand out as major achievements along with performance, reliability, dev tools etc. There's always more work to be done but the team knows that and they mention some of that in the team blog post.
I know from experience how much work goes into a major release like this. It's no small achievement. Well done IE team.