The apps running from the SD Card (and being able to place on a home screen), depends on how the programmer wrote the application. Basically every application is made differently, so only some apps work on the SD card, and others have problems once they are moved to the SD card.
The force close option could be many things. I have seen a lot of people with problems regarding the "stock weather analog clock widget" after the update. I advice a better clock from the market, and normally the force close problem goes away. Not the best solution, but it works.
"In an ideal world I would have all 10 fingers on my left hand, so my right hand could just be a fist for punching!"