I wrote a small program that will automatically check the current Carbonite version listed on the website and let you know if you need to update. Hopefully this will help with the complaints about there not being an auto updater yet. Idea being that this will catch a new version BEFORE you log in so you can download and install then go play and not have your play interrupted.
I've emailed Faatal the .zip file and I'm sure as soon as he checks everything over he will post it for your downloading pleasure and post here to let you know it's up and where to get it. ;)
Here's what you can expect.
The zip file contains three files, two icons and the program itself. Unzip it to C:\Carbonite Version Checker (or anywhere else you'd like to put it but you will need to know where it is so you can make a shortcut in a minute)
After you unzip you should make a shortcut to the program and place it in your StartUp folder so it runs when you start your PC.
The first time the program runs it will put an icon in your system tray then ask you for your current Carbonite version number.
As you can see I've entered 1.731, the current version as of writing this post. Enter your current version number and hit OK. Hitting Cancel here will exit the program completely.
That number is stored in the registry and then it checks that number against the current version listed on the Carbonite home page. If you are up to date you will not see any messages and the program will automatically check for a new version once an hour after that.
Each time the program starts up it will go look for a new version automatically. If it finds one you will see this message.
Hit OK and the program will store the new version number, replacing the old one in the registry and go back to waiting an hour to check again. You will only see the new version message once so it's up to you to go download the new version.
If you right click on the C icon in the system tray you will see this menu.

Set Current Version - allows you to manually change the version number that is stored in the registry. You shouldn't need to use it but if you do it's there. You will see the same dialog box asking you for the number as in the first screen shot.
About - Gives you a little info about who created this program and includes the legal notices for me and Carbonite

Check Version Now - allows you to manually run a quick check to see if you are up to date. When doing a manual check you will get a message telling you if a new version is available or if you are current. That way you know the program actually did something when you told it to.

Goto Carbonite Home Page - will open the Carbonite home page in your default browser. Handy if you want to update.
Exit Carbonite Version Checker - exits the program - you can also Ctrl+click the icon to exit
That's it. It's a really simple program and for the most part requires you to do nothing. I know it's not an auto updater but it should help. Enjoy!