This is probably not what you want, but if you go to the search page and use Search by User Name, put your username and you can find all the posts made by you.
Thanks for the suggestions. webmonkey you're right, it would be possible to intergrate as I'm sure I've seen this on other forums that use vBulletin. Maybe it's one of the exciting new features we are waiting for (although being new to the forum I might not have to wait for long )