[bombcar]

It would be nice if there was something like @eventually for everyone in the channel the next time they get on or similar.

[Cthulhu_]

Isn't that just the 'unread' marker?

I mean if it's imperative that everyone reads it, just send an e-mail instead or keep a non-interactive #announcements channel.

[Macha]

Isn't this the behaviour of @here? It puts a counter and highlight on the channel.