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1. Rails + SSE (server sent events) - http://tenderlovemaking.com/2012/07/30/is-it-live.html

2. Rails + Pusher

Those are the best solutions, at hand that would work well with Rails.

I wouldn't advise smashing a Rails app and a Meteor app together unless you have a solid case to do so (like migrating).

Rails, aside, I'm happy to here oplog has landed. 1.0 feels imminent, the tension is growing, even here in Toronto. Stop waiting sheeple, Meteor is great as is, and it's only getting better.