Hi Kulwant, these are great tips as usual. I particularly like the way to tell us to check the google pagerank in case the domain has been banned – that could lower the usefulness of the domain quite a bit. One thing though, don’t you think that buying domains is sometimes immoral? Like sometimes you accidentally buy a domain of somebody elses website who forgot to renew.
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.
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So, what to do? Simply, you must use someones other hard work and thinking. People have already contemplated all possible variations, synonyms, they know how domain names are valued, know about keywords, type-in traffic etc. Every day tens of thousands domains names are expiring. Every single day. That is hell of a lot expired domains to pick from. The reasons why people "let" domains expire are various. Could be somethins as banal as forgeting to renew, could be as serious as physical death. Many let domains expire because they don't need them any more. But that is not your bussiness to think about.