Here is the connection string I use in my ASP code:
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<%
set cnn = Server.CreateObject("ADODB.Connection")
cnnStr ="Provider=ORAOLEDB.Oracle;Data Source=summer5;User ID=scott;Password=tiger;"
cnn.Open cnnStr
%>
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Where Source is the SID in the tnsnames.ora file ... it's also the same as the Service Name in the tnsnames.ora file. (Pretty much it's the name of your Oracle database).
Any questions maybe I can help. Just email me!
Thanks!
-Coby