Yeah, some newer motherboards do not have IDE controllers, and most of those that do have a single IDE controller designed for the optical drives.
I personally think you'd be better off just forgetting about your IDE drive, or perhaps using it to keep your old mobo running as a backup system. Perhaps even recycle the old mobe for Windows Home Server purposes, if you want to keep the data storage capabilities ?
Or you could buy an external IDE case for the drive, and hook it up via USB (note that you would get I/O speed decrease if you did this) -- I guess it depends what you have on that drive and why you want to keep on using it
We know from experience and reports that mixing 'n' matching IDE and SATA internal hard drives in a Vista system is usually counterproductive in the best of cases, and can lead to blue screen and hard drives damage/corruption/partitioning errors...
One exception to the above : it is OK to run IDE optical drives with SATA hard drives