Restrooms are a welcome break from the message assault   

Ads for a captive audience  PDF

According to research noted by Media Life 

78 percent of restroom visitors interviewed recalled one or more of the restroom ads, according to an Audits & Surveys Worldwide study. The sample consisted of 14 locations in New York City, Boston, Chicago and Philadelphia. Interviews were conducted as patrons exited restrooms.  Of those interviewed 75 percent reported that they viewed restroom advertising as "a good idea". Additionally, 43 percent reported finding it "very good" and only 2 percent called it "very poor”.  The same study found 24 percent of interviewees felt more positive toward a brand after viewing the restroom advertising. Negative responses were 5 percent, with the remainder reporting not being affected by the ad.   Nearly 75 percent of interviewees felt that ads in restrooms are more noticeable than or equally as noticeable as ads appearing in other media, according to the Audits and Surveys study. 
Demographics: From Media Life, Apr 28, 2003

The gender of bar and nightclub customers using restrooms broke down to 55 percent male and 45 percent female, according to the Audits & Surveys study. Additionally: 

35 percent of respondents were ages 18-24 
44 percent were ages 25 to 34 
14 percent were ages 35 to 44 
7 percent were 45 and older. 
The education breakdown was: 

12 percent with high school or less 
26 percent with some college 
47 percent college graduates 
12 percent with graduate degrees 
3 percent with postgraduate work. 
Activities in the past 30 days, according to the Audits & Surveys study, broke down to: 

Accessed the internet at home or work, at 67 percent 
Went to a movie theatre, at 66 percent 
Bought a music CD or tape, at 61 percent 
Went to a health club, at 45 percent 
Attended a concert or show, at 35 percent 
Made a purchase over the internet, at 31 percent 
Also 26 percent of respondents visit a bar or nightclub twice a week, 24 percent once a week, 20 percent three times a week, and 13 percent four times a week. Daily visits were reported by 3 percent. Groups can be tightly targeted. For instance, Hispanics, African Americans, gays, sports fans and ravers can be singled out. "The most interesting thing about restroom advertising is micro-targeting," Roche says. "There’s a highly targeted delivery of demographics and psychographics."

Advertisers Reach Travelers at JFK RestroomsI.

According to the advertising company Media Life, there are over 50 flat wall mounted screens at JFK Airport Terminal in the men's and women's rest rooms.  The screens cycle still frames of advertising  According to media life the Ads run in a 30-second loop, and each ad shows twice per loop, for three seconds at a time.
More from Media Life

Restroom advertising gains foothold in market
commercialappeal.com - Memphis,TN,USA
Hannah and Emily Jordan (ages 4 and 8, respectively) wash their hands under a screen showing ads in a restroom at Malco's Paradiso, where ads are beamed in. ...

Restroom Advertising Companies

BillBoardZ  
Flush Media
Jonny Advertising   
Insite Advertising, Inc   
Wall AG USA 
ADpower
NextMedia and AlivePromo 

NextMedia and AlivePromo Collaborate for Networked Restroom Advertising
Monday September 13, 8:07 am ET Press Release Source: AlivePromo, Inc. MINNEAPOLIS, Sept. 13 /PRNewswire/ --

NextMedia, the nation's largest provider of indoor advertising, today announced that it has collaborated with digital sign company AlivePromo to install networked digital advertising boards in Minneapolis/St Paul area restrooms. The digital boards, displaying high-resolution, animated advertising, will be managed using AlivePulse, a patent-pending AlivePromo process that allows for content to be changed from anywhere with access to the Internet.   The deployment of digital restroom advertising is expected to extend and diversify NextMedia's indoor advertising reach; the addition provides more options for advertisers while making the concept more attractive to certain venues. ...