may not like the IE7 beta. Mine wasn't sure about it, and warned me that I went ahead at my peril. I went ahead, and it all worked perfectly.
There's only one way to find out about a public beta, and that's to try it. By the time software reaches the public beta stage most of the more serious bugs have gone, but remember that no major software production, no matter who writes it, can possibly be tested in a real-world situation until it - gets into the real world. That's the whole idea of these public betas, and you need to know it before you start. There may still be problems that won't be revealed until the software hits ten million machines or so, and ten million slightly different hardware/software environments.