Here's one way - click on your name in any post you've made, and you get a small menu, including an option to "Find more posts by guerillaunit" or whichever user you're looking at.
Here's another way - use the "User CP" option on the menu along the top, which lets you view all threads that you've subscribed to.
You COULD have a thread that you've subscribed to without posting in it, but for me, this is the main method for looking at my recent posts.