Keep in mind I don't know CF's code ofcourse ...

Have a 'upon log in' check that displays all buffered messages, targeted to you.

(As a receiver, I suppose you could be put in ghost status for as long as the text is scrolling by (similar to the new post-crash thing).)

As the sender, it could be just like a note (with only one (non-cabal) receiver):

dream to Dusatoit

dream yellow + The clouds part and a bright light pierces through.
dream cyan + As the light envelops you, you feel invigorated.

dream send

Sort of a delayed note with a destructive autoread.