Ups, seems like I should have read a bit more, sorry for that one
(So ^M now works fine)
The editwith -> pasteback -> editwith is a bit strange.
I have played around with it for half an hour now and don't know
whats going on. Sometimes it just won't copy the text into vim
and from then on I always get two error-bells when typing editwithmacvim.
(then editwith textedit won't work, too).
Deleting the text.txt made textedit work again, but not vim.
Well, most of the time it didn't let vim work again ... sometimes it did ...
The strange thing is, that just :q! this text.txt does not help, but
:wq on the empty text.txt helps.
I'll have to try again tomorrow =)