Looking for a good way to share address between many mail clients.

I am looking for a way to share all my E-mail address and contact info
between many different mail clients. I use many machines and would like
to be able to have all my address and numbers in easy reach…but I
also want it to be easy to maintain and not have to jump through hoops
to make it work. So my question is what do you use to achieve this. I
will open the comments section up for this so leave me a message.

Listening to: In Memory Of Elizabeth Reed – The Allman Brothers Band – The Allman Brothers Band At The Fillmore East