The text input field in the mail composer ("New mail") does not allow to "visually" (like with left mouse button pressed) select text, but moves the view instead. That makes it tedious to copy out of this view. Observed in 4:4.5~20100902.1170752-1maemo1.1170522 .
It's possible to select and copy/paste with the keyboard. Imho it should be possible to select text via touch based gestures.