After playing with Beta 1, I find the Beta 2 Preview to be worth it. Uninstall Beta 1 if you have it before installing Beta 2 Preview. My installs were seamless.
Note: The .Text editing window is a little flakey with delete/backspace and cursor positioning. It also has problems with the post body toolbar. Hmmm ... maybe a reboot.
Lots of people are calling this Beta 2 -- that is incorrect. The IEblog announcement calls a beta preview “a release for everyone involved in making the Internet work.“ While they anticipate it will be downloaded by the public at large, a later Beta 2 will be for the masses.