How can I remove locks on an object? One of my queries is running in to a Row Lock Contention. I've tracked down which table is causing that - so now what's the next step ? Which session is causing this table to get locked ? How do I remove the lock ?

I'm using Oracle 10g
Look in DBA_BLOCKERS and DBA_WAITERS. If you don't have these views, as SYS run @?/rdbms/admin/catblock.

You can remove the lock by killing the session, but you will then need to wait for Oracle, specifically PMON, to roll back that session's outstanding work.