If you buy a dropped domain from Snap or Namejet, the backlinks seem to be worthless for SEO.  They are valuable for traffic if it's targeted to your site.  Go ahead and 301 redirect into your site because it's the traffic from the back links that is worth something.  I use the Google URL builder to redirect these names so you can see the domain the traffic is coming from.
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Finally, we’ll look at a bit of a different animal in the expired domains world and that’s pending delete. To do that just click on the pending delete button which is right next to the Go Daddy Auction’s button. What this does is it shows you domains that aren’t quite deleted yet. So, they’re right before they get into this deleted category in expired domains. They’re going to be deleted, so they haven’t been renewed by whoever registered them, so they’re going to get dropped.
Now the numbers of errors, for we give up crawling a web site in case you know, they've got some kind of anti scraping technology or the web sites just completely knackered or something thirty is generally fine. Limit number of pages crawled per website most the time you want that ticked. I have it about a hundred thousand less you are going to be crawling some particularly big websites. I like that there, because, if you have an endless, crawl and there's some kind of weird URL structure on a website like an old-school date picker or something you don't want to be endlessly stuck on that website. Show your URLs being crawled. Now, if you just want to see what it's doing, you can have it on for debugging sometimes, but I generally leave it off because it makes it slightly faster and writes results into a text file so as it goes along and it finds expired domains as well as showing you and the GUI here, you can write them into a text file just in case there's a crash or your PC shuts down or something like that.

Since high quality expired domains are in low supply, the huge numbers of marketers competing for those drop domains tend to drive prices up. Also, if you use an exchange, you’re basically lucky to get whatever you can afford. In other words, niche specificity isn't guaranteed. This is going to be a problem because as Google continues to evolve, it is cracking down on domain niche relevance. In other words, its software is fast evolving to the point that it can tell what the niche of a particular domain is. If your private blog network is a patchwork of expired domains that involve many different and dissimilar niches, then you might be in trouble. You are at great risk of being penalized by Google.
Most popular auctions with expiring domains are at godaddy, namejet, snapnames. Search for expired domains name its very easy if you have domains list. With a bit luck, you can drop good one with PR5 cheaper like $200, just need to know which domain have not fake pr. List of domains are not free, but updated dailly with aprox. 50.000 new expiring domain names.
Everybody going to start using old domains should also know how to get them, I'm going to post soon article about it on seomoz as there are several ways starting from online rankings and lists up to dedicated seo tools that you can run on your computer and get precise and actual data on demand for any domains lists. Anybody intersting in such tools please visit our website: http://en.exdomain.eu/

However, Pool uses what some have called a “two-phase” auction system. This means that once you win your original backorder, Pool will then move you into the auction phase where you compete with other bidders for the domain. Pool doesn’t reveal how many bidders there are or what they’re bidding, so you have to offer the highest price you’re willing to if you want to get that dream domain.
The way this list is implemented means I can't update prices, nor removed sold domains automatically and sedo doesn't provide me with the tools I need to implement it properly. Unfortunately some users keep contacting me to update their domain prices or remove their domains and I can't keep doing that manually. So I've decided to disable the list for now.
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