SkipLists sound cool as well.  One of those things that you see moving 
around in the image and try to remember it for later.  Because it doesn't 
come up much, but if it does it could really save some time.

>From: "Damien Pollet" <damien.pollet at gmail.com>
>Reply-To: The general-purpose Squeak developers 
>list<squeak-dev at lists.squeakfoundation.org>
>To: "The general-purpose Squeak developers 
>list"<squeak-dev at lists.squeakfoundation.org>
>Subject: Re: About MappedCollection
>Date: Thu, 24 May 2007 22:02:23 +0200
>
>On 24/05/07, nicolas cellier <ncellier at ifrance.com> wrote:
>>Are Stack and SkipList more used?
>>
>>Even Bag is rarely used.
>
>I did use it
>
>>LinkedList (Process only).
>>Heap (WorldState, Zip).
>
>We were discussing that squeak lacks some base data structures like
>hash tables or balancing trees... not useful that often, but needed
>for algorithmic code and difficult to write properly.
>
>--
>Damien Pollet
>type less, do more [ | ] http://typo.cdlm.fasmz.org
>

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