https://www.nytimes.com/2010/12/21/technology/21email.html
Article from Monday's NYT. I'm not really surprised that the use of email among "younger" users is falling in favor to things like text messaging, IM, etc.
I still use only email (both personally and professionally). I have an "internal" IM client at work, but still all official communication is done via email. I don't have any IM clients on my home pc, and I don't have a smart phone or a text messaging plan so I rarely get text messages (plus it takes me too long to type out a text message). I do have an iPod touch and I find that sending email (albeit short ones) are very easy to do on it.
What do you think? Do you find yourself using IM/text messaging more than email?