Um, no:
Emily and Peggy Post
Amy Vanderbilt
Letitia Baldridge
Judith Martin
Marjabelle Young Stewart
Etiquette: the rules and conventions governing correct or polite behavior in society in general or in a specific social or professional group or situation
According to buzzle.com
http://www.buzzle.com/articles/thank-you-note-etiquette.html, among other things "•A thank you note is not a thank you note unless it is handwritten. Sending a typed or printed piece of text as a gesture of thanks, is extremely impersonal and impolite. A handwritten thank you note always has a bit of personal touch to it along with a sense of genuineness."
ehow.com
http://www.ehow.com/way_5201651_thank-etiquette.html states "
Whenever you receive a gift, you should send a written thank you note. Our society is drifting away from such niceties, substituting phone calls and emails instead. There is nothing, however, that says you truly appreciate the thought and kindness behind the gift you've received than a heartfelt, handwritten thank you note."
And Oprah's experts
http://www.oprah.com/oprahshow/Thank-You-Note-Etiquette, in response to the question 'Is it okay to send a thank you on email?', say:
Ceri Marsh, etiquette columnist: It's okay…but why not do something that's great?
Harriette Cole, syndicated columnist: It also depends on whom you're sending it to. If you have a person who lives on the Internet, you can get a thank you card that that is animated and dances and does all kinds of fabulous things. If that person would love to get an e-mail thank you, that's the person you send it to. Your momma doesn't want that. She wants appreciation and handwritten notes!
E. Jean Carroll, Elle magazine advice columnist: We send thank you notes because we want to be loved and admired. And if you want to be loved and admired, you send it on stationery so thick it's like ice cream and you write it by hand—it's just elegant and it's fun to get it!
Before you claim, "they're olllllllld!", Oprah's experts are relatively young, the show aired in May 2010, and good manners NEVER go out of style.