ArcCatalog interface to PostgeSql question

I have seen mention of a way to interface ArcCatalog or ArcMap with
PostgreSql but I can not find any details.

I am using PostgreSql 8.1 and have tried to set up ArcCatalog by way of
"Add OLE DB Connection" and "Add Spatial Database Connection" but can
not get things to work

When I try "OLE DB Connection" I see PostgreSql OLE DB as a provider in
the list of options but I can't find anything that says what to use for
"Data Source" nor "Location" parameters. I tried "localhost" as the
location but got a "Test connection failed because of an error in
initializing provider. Unspecified error" message.

When I try "Add Spatial Database Connection" I get an error message
(Failed to connect to specified server) from ArcCatalog and the
postgreSql logs show the following:

2005-05-03 14:12:43 LOG: database system was shut down at 2005-05-03
14:12:06 Eastern Standard Time

2005-05-03 14:12:43 LOG: checkpoint record is at 0/14282C0

2005-05-03 14:12:43 LOG: redo record is at 0/14282C0; undo record is at
0/0; shutdown TRUE

2005-05-03 14:12:43 LOG: next transaction ID: 4226; next OID: 22625

2005-05-03 14:12:43 LOG: database system is ready

2005-05-03 14:12:58 FATAL: unsupported frontend protocol 65535.65535:
server supports 1.0 to 3.0

2005-05-03 14:13:14 LOG: received fast shutdown request

2005-05-03 14:13:14 LOG: shutting down

2005-05-03 14:13:14 LOG: database system is shut down

2005-05-03 14:13:14 LOG: logger shutting down

I believe the unsupported frontend protocol message is coming from the
ArcCatalog test connection attempt.

If this is not the correct forum for this question please direct me to
the correct one. Since this an interface issue I thought I would ask
here first.

I have used Google to search for set up guides but could not find any.

My current task is to get ArcGis tools to display data from a PostgreSql
database (first vector then image".

Any suggestions would be greatly appreciated.

Bruce