I don't normally write these sort of blog posts, but Oracle's been keen to let customers know how simple the upgrade of Oracle Forms 10g to 11g is. One of the major sticking points for customers is that this requires a move from Oracle Application Server and OC4J to WebLogic Server, a foreign application server platform to many traditional Oracle sites.
SAGE Computing Services assisted the Department of Treasury and Finance in Western Australia in undertaking such an upgrade in late 2010, and we can attest to the fact that this is an easy process, Oracle's WebLogic Server is fully capable of running your production Oracle Forms systems.
For those interested Oracle has recorded the success in a whitepaper.
So now there's no reason to upgrade to Apex or ADF, just upgrade your Forms system instead!