It won't tell you if the name is good, but it should save you the pain of picking a bad name.
- Is .com available?
Usually it's the first one to go
- Is there a website behind it?
Just go to the URL
- Can the domain be purchased?
A fixed price offer is a good start
- Any connotation?
Ask a few people what they think it is for.
- Can it be mis-read?
E.g. List Entropy => list|entropy.com -> listen|tropy.com
- Is it easily transcribable?
Can you tell someone the domain name without needing to spell it out?
- Do people know how to spell it?
You have to set the bar low. Really really low.
- Can it be easily misspelled?
It sure will be.
- Can it be spelled in more than one way correctly?
color.com vs colour.com
- How crowded is the domain space?
Are there many other TLDs with this name?
- How crowded is the search?
Does it have a chance of appearing on page 1 for its own full name search?
- Does it infringe on any trademarks?
Check every word separately. FB was chasing anyone using word BOOK unless it is about books.