What is the easiest way to move data from Oracle to SQL Server?
I actually used the "Microsoft SQL Server Migration Assistant (SSMA)" from MS once for this and it actually did what it promised to do:

SQL Server Migration Assistant for Oracle (documentation)
Microsoft SQL Server Migration Assistant v6.0 for Oracle (download)
SQL Server Migration Assistant (SSMA) Team's Blog

However in my case it was not as fast as I would have expected for a 80 GB Oracle-DB (4 hours or something) and I had to do some manual steps afterwards, but the application was developed in hell anyway (one table had 90+ columns and 100+ indices).