I have to say, not really turned on to it either.... this is only beta update up from the official. Like earlier stated, downloading all updates/patches for 7000 install fixes mp3 issue off the top. I have only had minimal gadget "crashing", if you want to call it that, during shutdown, which i narrowed down the problem (same problem with norton360 gadget not closing). I have UAC enabled at high and dont have any problems what so ever.
Atleast with this build, feedback coming into MS will hopefully help and fix things. As if ppl even send feedback, coming from a 7022 build will of course raise eyebrows not too mention.
Lastly, paint and ie blue panel? I'm sure there are other things as well, but arent they "new"ish? so, probly buggish as well chances r? maybe this is why it was a wrapped beta and not released publicly (sarcasm). Unless big changes occur as to where things are at/located, or somekind of compatibility improvement, i dont see the use... I would suspect that MS will update fixes for the 7000 beta that are included with later betas. As why would they not want to test "new"ish things more broadly if they are to be included in a RC1 or a RTM for that matter.
As with whistler, not much changed from after the first 6 or so months of betas, and RC1 was just a dustup of the last few betas leading upto RTM. which i think had nothing visable unless running some newish hardware or involving drivers. with most fixes being off the wall drivers, a few printer problems, and some software companies not up to snuff with the OS. Basically the same type of scenario again here with win7 as far as i can see. I probably wasted half a spindle of cdrs with all the pre-beta, beta, rc1 ect.
I know longhorn had many stages thru the betas and so on, but come on now, that was a trainwreck of progress there... and we all know the rest of that story... I believe win7 is the rest of the story. what MS had in mind when creating Vista/longhorn, but of course got into the $$ hungry rush to release an eye-candy OS for 64bit.
From my experience, once a beta is "working", no need to upgrade unless it fixes an issue, usually hardware, that you have. Until then it will be *****ed and prodded, tweaked and geeked, but fundamentally the OS will not change itself from now ... being that its dubbed a public release and then a candidate
...just another long humble opinion