Hi!
Michael pretty much summed it up for you. There's no concern of anything bad. Plenty of blogs etc have the URL as part of the date structure (even mine!).
If I were to start over I would not use dates - or I would put the dates at the end of my URL like: domain.com/blog/post-about-something/06/08/2012
But no need to switch now that you've already started that way - especially if you have like more than 10 posts.
Its argued in some cases they are good to have for analytics purposes. Almost like Michael is talking about with URLs having product IDs.
But you're not in danger of a penalty or unusual algorithmic filter or anything that I'm aware of.
-Dan