in Calc when cursor in formula field (not in cell) I can not enter new line (linebreak). I tryed enter it by press Ctrl-Enter or Alt-Enter or finding such character in menu Insert. It not work. (in MS Excel it works by Alt-Enter)

Last four years I think that OpenOffice has no such functionalyty. And only in this month accidentally discovered that if doubleclick cell and begins inline editing, only then I can insert linebreak character
And from LibreOffice 3.3.2.1rc1 available pasting some text from Writer to Calc inside of cell on Linux 64 bit.

produced using Mandriva 64 bit and windows XP 32 bit Libreoffice 3.3.1.2 and 3.3.2.1 rc1