A great rule for a brochure is, “If you can’t say it all on a business card, you shouldn’t say it at all.”
(Okay, so it’s not really a rule, but it should be.)
Distill what you want to say about your product or service and fit it on a business card.
Instead only offering your contact information, place a few bullet points and add some nice, simple graphics to the back of the card. By doing this, you are able to leave those you meet with a message that they can carry with them or organize into their Rolodex. (This presumes you made a great enough impact to compel them to keep your card.)
Example: Feeling clever? Leave off your contact information to complete the “brochure card” effect. Place the logo and tagline on the front of the card, and the content on the back, for a playing card–type feel. Also, by utilizing both front and back in your design, you can leave two cards on a bulletin board or elsewhere, flipping one over to create a small, two-piece brochure/billboard effect.