Howdy!
While this Play Time Counter (http://dl.dropbox.com/u/6237857/PlayTimeCounter.exe) program isn't as cool as my Graphical Status Bar for MushClient (http://www.zalanthas.org/gdb/index.php/topic,34979.0.html), you may still find it useful! Well, probably not. It's more of a novelty really. Use it to track your log in time down to the minute, even across characters.
It saves a little text file with your total time in the same folder you save the program file. I recommend saving it somewhere in or near your character logs or client directory, and then creating a shortcut for it on your desktop or wherever.