There are many good but unused domain names in the internet which are mostly parked with ads only.
1. Technology.com
One of the best domain name in the internet. It may cost millions of dollars to buy this domain. But it is still with advertisements only.
2. Msn.in
Microsoft’s portal Msn didn’t register this domain and domain squatters have registered it well before Microsoft.
3. Tool.com
One of the best domain that can be used for tools related to sofwares, mechanics, etc.
4. Markup.com
The most suitable domain for webdesigners.
5. Geo.com
A good domain name for solutions like Map, Location based services.
6. OperatingSystem.com
One of the very good domain to show about the Operating Systems.
7. ElectronicMail.com
The full form of Email but with no use.
8. Exam.com
Students hate this one. Well others too. But one guy take this well before others.
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http://www.blogrpro.com/75-top-rated-unused-domain-names/660/