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What is a
collection of objects for .NET 2?
(à la List<T>, or an equivalent of HashSet<T> from .NET 3.5, but without ordered items)
Unfortunately, the first good framework class for this is the HashSet, which you will only get access to with .Net 3.5.
If you are stuck in previous versions., the options are not as nice. The most common is to usea Dictionary type where the Key is the value that you are trying to store. You can wrap this in your own class fairly easily.
If you are willing to go outside the framework all together, there are collections of data structures for .Net, such as NGenerics.