...and replaced it with one that seems twice as fast. I can't believe how much faster the browser loads... And the icon problem is definitely fixed, so I can run Google Skymap again!
Everything else is much faster and snappier.
Thanks to HTC for getting to this so soon.
BTW, for those who haven't upgraded yet, when you do upgrade, the phone will reboot and sit there for about 5 minutes with only "HTC" showing on the screen and get really really hot - but don't Panic! For a few minutes there, I was wondering if I had bricked my phone. But all is well.
I also got back 8MB of RAM
On the downside, when you first boot the phone, it takes a very long time for the widgets to update; they do eventually, but it takes longer than before. Also, battery life looks to be shorter than before, though I will wait a few days to be sure.