Outreach to probably compatible groups?

At Balti­con, there was a table for hu­man­ists, the Eth­i­cal So­ciety, and skep­tics. I told one of the folks there about Less Wrong—he seemed in­ter­ested and I’ll check back with him, but he’d never heard of it at all—it took a lit­tle time to dis­am­biguate be­tween Less Wrong and what he heard as a hu­man be­ing named Les Wrong.

Any­way, what do you think of do­ing out­reach to fairly com­pat­i­ble groups (I’d add Uni­tar­i­ans to the list)? And if so, what would be good meth­ods?