I was on the MS campus in Redmond a couple years ago when these were revealed to MS Access MVPs. The reaction of the MVPs is probably best kept under NDA ;-)
I could see where they will have value to some users. For instance, if you want to track people who might be on various mailing list. A beginner might create a table structure like:
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tblMailList
==============
PersonID
FirstName
LastName
Address
City
State
Zip
Phone
Christmas (y/n)
Family (y/n)
SkiClub (y/n)
Church (y/n)
Scouts (y/n)
Enemies (y/n)
[/green][/tt]
Now the same beginner might set up a multi-value field to store which list(s) a person is a member of. I feel this would be a huge improvement over multiple y/n fields. (I said the same in Redmond)
Duane MS Access MVP
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