Everybody will offer you a review of the new beta 2 of Internet Explorer, so I won't bother to do it as you won't read it ;-)
Instead I'll just point out that in a 5 minutes test drive I was able to make it crash constantly, so I've created a simplified testcase and filed a bug in the MS Connect.
I'm not sure about what to expect here from MS. On one hand every crasher should be taken seriously, the tab crash restoration system is very good, but anyway it's a really unexpected situation that should be handled better. I don't think that they have announced the plans for the next version, would it be a Beta3 or RC1 ?
Releasing another beta makes sense because although there have been lots of improvements in this version, it still have lots of thing to polish, opacity isn't supported, dynamic VML doesn't work, there are a bunch of crash reports. I'm not sure that many developers are going to adjust their sites at the moment in this state of things, so it won't be tested properly and there might be still some other issues that are not gonna be known. A RC should be something that can safely be renamed as the final version because all the work that it's planned has been done and there are no big issues pending, and I'm a little sceptical that they can manage to fix all the big issues without another public beta in order to test that they have been fixed and nothing new has been introduced.
For example, the editing part wasn't ready for Beta1, this new version works quite better in FCKeditor, but even using the latest nightly if you try to insert a table it's done at the start of the content, (I guess that it will fail also with other elements, but I haven't done too much research about it), and the fact is that many times the errors can't be discovered just in one session. Some parts are clear and can be tested very easily, but other times it's the interaction between some elements the one that can trigger the problem.
Another example is the wrong dimensions for the content of the dialogs, seems related to the overflow:hidden in the body of the content, but why does it affect it that way, and sometimes it's displayed properly and then it goes wrong?
Trying to apply patches in FCKeditor for a beta that might change in drastic ways for the next release doesn't make sense, what we need are nightly builds of IE8 and more detailed info about the problems that they are working on. Yes, mark as invalid any ticket in Connect regarding new features, just give as a IE8 that does work at least as well as IE7 and that aims to be as good as the rest of the browsers.