Do you track your link exchanges?

Do you track you link exchanges? What I mean is do you regularly check that the other person is still linking back to you?

If you do, how do you check 3-way links? Surely if you have a lot of 3-way links, it will take more time than it is worth to manually check them all?

Btw, I use software to check the normal reciprocal links, although this is starting to become quite a time consuming task.

Just wondered what your opinions were?

Thanks