I received a Hang Masters direct marketing brochure in my mailbox and gave it to my mother to try. She is in her 60's and has tons of pictures, plates, etc. leaning against the wall just waiting to be hung. She finally realized that she would never get around to putting them up (and probably shouldn't have been lifting some of the heavier items, mirrors, etc. anyway). She called these guys and they had everything hung within 2 hours for around $200. The employees wear white gloves to ensure no dirt smudges on your hangings or your walls. I can't say enough great things about this company, esp. since they got me out of having to hang pictures all weekend with my mother!!!
Pros: Quick Response, Nice People, Got the Job Done Perfectly