PowerObjects had a great little blog post on Internet Explore 8 when it came out highlighting a few of the cool NEW features that are worth learning about if you are using Dynamics CRM.
Now that IE 8 is part of your everyday routine (and you are thinking about IE 9) take a look at this post on some of the features that might have slipped your notice in what you ALREADY have.
Oh and in terms of security (for those of you running other web browers)
"Testing conducted by the independent NSS Labs found that IE8 provided signifigantly better malware blocking capabilities than Mozilla Firefox, Opera, Google Chrome and Apple Safari."