Blackberry: Heirarchical Data Manager?

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Did I even *spell* that correctly?

Anyhow, I've been jonesing after a PDA/Phone for a couple of
years now, but never went for one.

Guy at work let me play with his Blackberry for awhile today, and
it looks promising to me.

But I've got a whole bunch of hierarchical lists on my Palm in an
app called "BrainForest".   Nothing sophisticated.   MS Word in
outline mode would give me all the functionality I need.

So... does anybody know of such functionality that runs on a

Also is Blackberry a closed or open system - in the context of
third parties developing software for it?

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