Yep, there it was: the first nasty freeze of my new phone. This is a little computer, after all. It was ugly too: screen update failure, no initial reaction to anything including holding power button. However, it turned off eventually (before I took the battery out) and then would not turn back on. After removing the battery for a while it seems fine again. And all I was doing was enter a new calendar entry while having the phone connected over USB. <sign>
Also, I have been trying out more normal Windows Mobile usage, turning TouchWiz checkbox off so I get the normal WM6 start menu. However, this seems to give a silly hybrid, as Samsung has included touch based versions of some WM6 applications, left the originals, replaced some completely and left a couple. This means, no matter what WM6 theme you select, some setting dialogs and sub-apps still show up Samsung like, with the black background. Also, why does the Samsung start menu (which looks good, but takes a rather hefty 8+ Mb of RAM when running, possibly due to graphics) only have two color themes to choose from, that both have absolutely nothing to do with the WM themes? <sign>
I'll get my exact use of this thing sorted yet: will (have to) use it for the next two years, after all.