Yes,
go to the Settings tab right at the top of the page,
then go to General Settings,
There's a drop down menu next to Default Thread Subscription.
You can then choose whether to be emailed instantly, daily, or weekly with updates, OR have them sent to your control panel and not emailed.
BUT this will subscribe you to threads you reply to as well as the ones you post yourself.
I haven't spotted a way to just subscribe to your own threads.
Hope this helps