If you have PR at all with them then you're probably going to know it already since that's usually home page links and you have to work out special deals for them. There are programs that will track this although it's software you have to buy and I'm not aware of anything free doing this. However that's not a big deal and it's nothing you really need to know or track - just get the links and then let them do their thing. Ken King Cobra Poker
use this one (from some Australian SEO company) http://seopro.com.au/free-seo-tools/link-checker/ Give's u PR, attribute, link count, anchor etc
I used to use backlinkwatch.com as well, but it has been broken for quite some time and no longer shows anything accurately other than the link itself.
Actually I think the whole idea of checking the PR of your backlinks is a little ridiculous and a waste of time. People are just too obsessed over this kind of thing. And what will they do with the information after they see it? Nothing probably. But it may give them a warm fuzzy feeling all over.
I guess iwebtool can do it.. But, they are showing incorrect results in recent times. If you want a software rather than an online tool, Try Seo Elite. thanks.