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.

Know your rights under the Anti-cyber squatting Consumer Protection Act (ACPA). This is the main federal law that deals with domain name trademark disputes. These distinctions are still a legal gray area, and being able to make these claims is no guarantee you will win a case. You should consult with a copyright lawyer to help determine the validity of your defense. If you are accused of cybersquatting, you may be able to keep your domain if you can make any of the following defenses in court:
The second option requires a bit more time and effort than a 301 redirect. You could do a mini overhaul of the site and turn it into a microsite for your main domain. This option is good for exact-match domains for your targeted keyword, and there are other reasons for going the microsite route that Rand's highlighted in his post about root domains, subdomains, subfolders and microsites. This strategy also works better if the old domain has decent rankings for the keywords you're targeting.

Many non-savvy internet users may not even be aware of the existence of other extensions. That said, because there are many new extensions popping up every now and then, you can often find amazing one word and 3-letter domain names with these new extensions that are otherwise almost impossible to find unregistered in the .com world. Additionally, these new extensions are becoming more and more familiar to users every day, hence it's almost certain that their value will continue to increase as time passes and wider adoption manifests. 
Control your expectations and keep them based on facts, data and expert opinions. Use a tool like EstiBot to get a general idea of how much the domain may be worth. Do understand that this is an automated appraisal tool, so take those numbers with a grain of salt. However, it’s great to get you started. You can also use paid, human-based appraisal services from Sedo and other providers, but these can get costly. If you’re not careful, you could easily overspend on such services and then realize your domain may not even be worth the appraisal fee.

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As far as flipping domains for a profit is concerned, there are certain domain names that are worth a lot of money. For instance, Hotel.com and Business.com have been reportedly sold for $11 million and $7 million respectively. Now even though coming across such golden domain names seems more like a long shot, you can still make a decent amount of money if you choose to buy and sell domains as a part-time business opportunity.
Length: This is pretty self-explanatory. Generally the shorter the domain name, the more valuable it is. This difference in value decreases exponentially as the name gets longer, though. For instance, the difference in price between 3 and 4 letter domains are significant, while the price difference between a 7 and 8 letter domain would usually be much less significant.