There would need to be something in the url which uniquely identifies that blog entry. The title may identify it, but you would then need some kind of look-up to associate the title with the id.
Alternatively, you maybe could use the title as the key to pull the entry from the database.
I think the easiest way is to combine the title and id, something like www.domain.com/5-blogtitle that would give a more meaningful url which includes the title, but also includes the id for the purpose of pulling the data from the database.