If your domain name was in fact stolen from you, please go file a police report as soon as possible. If, instead, you allowed your domain name to expire through carelessness or ignorance, then you’ve learned a valuable lesson: domains have value. I’m not saying this to be a jerk, I’m saying this because words matter and saying something was “stolen” when in fact it was allowed to expire is not truth. I’m happy to share my knowledge as clearly as possible for others to benefit from, and all I ask is that others do the same.
Yes, we port in all of the domains from NameJet, SnapNames, etc. There are a lot of great deals to be found. Some are absolute trash of course but if you can sift through them and put some time in (hopefully that is what we are trying to do with our tools is save time and give some value add with the SEO metrics, alerts, etc.) then you can find some great bargains.
I am interested in a domain name that is set to expire in April 2016. The domain is registered with Domain.com, so I have placed a backorder on Snapnames.com (thanks for confirming I at least did that part right). I also placed backorders with NameJet.com and Pool.com, based on previous advice I received. Now I’m wondering if that might be overkill since Snapnames is the designated auction house. Will I ultimately end up bidding against myself?

If you buy keyword specific domains, you're really buying the type in traffic.  I use the URL builder and redirect through that URL so you can see how much traffic your getting from the keyword domain.  There seems to be no rythme or reason to what keyword domains deliver traffic and what don't.  By tracking traffic with the Google URL builder you get a feel for what names are giving you traffic and which are not. ie. the plural, the singular, two words, three words, the possessive, etc.
GoDaddy Auctions is a marketplace where GoDaddy lists domains that have expired and are in the renewal grace period. Apart from these GoDaddy also lists other domains, but the expiring auctions at GoDaddy are the most popular. Based on the percieved value of the domain, domainers and SEOs bid on these auctions. If the original owner does not renew the domain, the top bid wins the auction and gets the domain name.
What you really want to do first is scroll down to where it says, referring pages for anchor phrases. All that is is the anchor text distribution to that site. As you can see here this looks like a very natural link profile. Brand name, a product that they had, no text, URL, shopping cart, wireless government. These are the keywords that were related to what that site was about. Okay?
We do not only have Expired Domains, but you can also find lists of Deleted Domains for a lot of TLDs. Deleted Domains or Dropped Domains are available for registration and can be picked up for just the normal regfee at your preferred domain registrar! All Domains have the typical SEO relevant data, like Number of Backlinks, Archive.org Birth Date and a lot more.