Question regarding PR

[Zapcat]

Firstly, apologies if I have posted this in the wrong thread - wasn't quite sure what it should come under.
I have two sites currently - a PR5 site and a brand new PR0 site, both in highly competitive markets (gambling). I have recently acquired, for next to nothing, 2 domain names which are both showing as PR5 on Google, although not hosted at the moment. My question really is, has anybody got any suggestions as to what I should do with them? If I redirect to my current sites will the PR help my sites at all? I'm not sure about the traffic to these new sites, they're not ranked very well on Alexa - is there any other tool anyone knows of which could tell me what sort of traffic is landing on the unhosted pages.
As you have no doubt realised I'm not very sure what I'm talking about here :) :) Any help and advice would be gratefully received.
Thanks

[maherphil]

I wouldn't redirect them (as in a 301 redirect) to your current site because Google doesn't like it when people do that (it could be viewed as a spammy way to redirect).

If I were you I'd setup a blog site on each of them and just talk about your subject. This way you have new content and can put links to your gambling site.

As far as the tool to use that will track traffic like Alexa. There's a tool called media metrics so something that might help in this. Anyone know what this is really called?