Dropbox is pretty handy for documents, projects – and you can use it for notes. There are a number of applications that will accumulate notes, as in a log. You can even do it with Twitter, but something i am using right now is TextBoxApp, which is a website that will connect to your dropbox (I am guessing you have to have DropBox installed on the machine for this to work) and let you view\edit text documents in your browser.
http://textdropapp.com/ is the site you go to to configure your account so that when you return, will let you login, and view the files in your dropbox. Create a file like 2012January (numbers to the top), edit it in your browser, and it will follow you home.