Yeah, I ran into this same problem trying to create an hashtable instance va
riable for a portlet. I dug around in the portal jars, decompiled classes an
d still couldn't find anything.
I finally resolved to use the portlet title as the unique key. Yes, I know t
hat when you clone a portlet they have the same name but, let's face it, hav
e the same title for two separate portlet clones is not too bright. After in
stalling the original portl
et, I make clones for all the instantiations. I never put the original on a 
page just the clones. Each of the clones has an unique title since each one 
is configured slightly different.

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