Oracle 8i (8.1.6)
PL/SQL Server Pages (PSP's)
DBA Studio Introduced
Statspack
New SQL Functions (rank, moving average)
ALTER FREELISTS command (previously done by DROP/CREATE TABLE)
Checksums always on for SYSTEM tablespace allowing many possible corruptions to be fixed before writing to disk
XML Parser for Java
New PLSQL encrypt/decrypt package introduced
User and Schemas sepapated
Numerous Performance Enhancements

Oracle 8i (8.1.7)
Static HTTP server included (Apache)
JVM Accelerator to improve performance of Java code
Java Server Pages (JSP) engine
MemStat - A new utility for analyzing Java Memory footprints
OIS - Oracle Intergration Server introduced.
PLSQL Gateway introduced for deploying PL/SQL based solutions on the Web
Enterprise Manager Enhancements - including new HTML based reporting and Advanced Replication functionality included.
New Database Character Set Migration utilility included.