How can I change document names within an open application in Lion?

I often download documents from the net that have arbitrary names (e.g. a pdf titled 346-56-766) and want to rename them with a relevant (to me) name and at the same time, place them in a specific folder on my machine.

Maybe I have missed something in the new OS, but the save as... function that allowed you to do this easily, has now gone. Is there a new way to do it? The workaround I have is to make a duplicate document and then save this. This seems both awkward, illogical and extra work, so I hope there is a quick renaming function available.

I am not talking about renaming within Finder, which is easy enough, I mean while the document is open on the desktop.

Any ideas?

 

Hmm, ... I guess so. I wish they would implement a rename/move option in the menu. Would make it a lot easier, and more logical. Duplicating and saving gives a totally different mental model, even though, essentially, it does the same thing.