I'm following an old tutorial from January 2006 (Blender Art Magazine). It mentions IPO curves and delta channels. I'm now working in Blender 2.75a and I can't find any IPO curves except the Graph Editor and F-curves. Also can't find delta channels. Has it changed since version 2.40? If so, how or where to find the same functionality in new Blender?
The online manual states that "In Blender 2.5, IPO Curves have been replaced by FCurves, however, editing these curves is essentially still the same." https://www.blender.org/manual/animation/editors/graph/fcurves.html
I'll dig more for "deltas" info.  see this thread an BA it may help you: http://blenderartists.org/forum/showthread.php?219126-Move-Existing-f-Curve-to-delta-equivalent [/edit]
I discovered there is an option "Animated Transforms to Deltas" available through the space bar command search tool, it should derive by this GSoc work http://aligorith.blogspot.it/2011/05/gsoc11-greeting-goodies.html (this is what the last comment in the above cited BA thread refers to)