You guys don't know any links where to get such Information?? As far as PR4, that doesn't mean jack shit, you can get that in no time. But as far as I know the new google regulation will put a stop to taking over domains with PR's. From what I've heard the following will happen in the near future - as soon as a domain switches owner, all the old links to this site will be deleted by google itself. In clear lines, that means the PR4 will become a PR0, but of course you'll still keep the link popularity ,o)
PS. There are some pretty cool links in the Internet to get such info, and a PR4 isn't anything special. I've seen PR7/8 cumming by, Alexa Rankings of 50k- and more then 4,5k links to specific sites. It's funny info, and with the waybackmachine.org you can also check out what the site was selling before it went offline. But that's all Noob information!
An example of some PR7 Domains running out:
ayecor.com (Expires: 2004-04-08)
picturepeak.com (Expires: 2004-04-08)
playmatecenterfoldy2k.com (Expires: 2004-04-09)
sciencenewsweek.com (Expires: 2004-04-07)
theultimatenews.com (Expires: 2004-04-11)
yourautoresponder.com (Expires: 2004-04-07)
Furthermore:
69 PR6 Domains expiring
490 PR5 Domains expiring
1733 PR4 Domains expiring
etc etc
And if you're totally loving a good Alexa ranking, check out 51se.com! It's expiring on the 9th of this Month ans has a ranking of 17.529.