Find who is connected to a database

I'm trying to drop a database in a postgres 8.1.4 instance (x86 Solaris
10 OS),  but someone is connected to
the database.  What is the best way to find out exactly who is connected?

Thanks,
Naomi

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Naomi Walker                          Chief Information Officer
Mphasis Healthcare Solutions          nwalker@mhs.mphasis.com
  ---An EDS Company                   602-604-3100
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"Intellectuals solve problems; geniuses prevent them."
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