People seem to be misapplying the word "beta" to Microsoft's "beta" products.
For MS, a product reaches the public (as IE7 for XPSP2 has currently done) when it has entered the final stages of beta. This implies a feature-freeze (sorry, RSS support will still suck, ActiveX behavior is not going to change, and the tabs are going to stay exactly as they are).
This problem will not be "fixed." On the contrary, IE7 is "working as intended."
If you'd like, I'll be happy to file as many bug reports as I can on the subject, and MS reps will be happy to close them all, filed as... "as intended."