Of course you do, everyone works with collections. Wintellect would like to help you work with better collection classes, and they'd like you to help create them. From the site:

Leading the development effort is Peter Golde, formerly a Lead Designer for the C# language. Peter is currently building the starting set of classes as well as incorporating ideas from the community into a set of collection classes to be made freely available to the public.

TTFN - Kent