ECO, Borland's Enterprise Core Object technology, is the one technology I really would like to learn and to work with. This .NET technology keeps you focused on the bussines objects. ECO seperates your code from the way you persist your data.
ECO provides you with one technology, and several persistance possibilitys. (Database, XML)
Unfortunately this technology is only available for the Architect SKU and, even more unfortunately, I don't own this SKU. (yet)
The only thing left are the great video's that were posted today on BDN TV, which give you a nice introduction into the ECO 'space'.
MDA Tour 1 Eco modeling and UI
MDA Tour 2 Persisting your ECO space