Well it comes down to: Can you prove he has copied it directly from your site ?
It is very difficult to prove if it is a list of "facts" - and as you say he can just reword a few of the listings....technically everything is protected by copyright, however unless he is copying entire articles/pages there is not much you can do.
Besides, if it is not a big deal...not worth the trouble, however a polite backlink request might give you a free backlink
