This is sad to hear. I use the site frequently as a quick reference for tables and columns.
Before I found the site I printed table specs from a fat client:
- Open OMW
- lookup table object
- copy the table into my default project
- open Table Design Aid and click print.
It comes out in a neatly formatted page(s) including column alias, description, length, indexes, etc.
JDERef.com took this multi-step cumbersome process and made it instantly accessible from any browser. It's a shame Oracle forced them to take it down. I will miss the handy resource.