Whilst many of my colleagues in Australia and USA use DELTA, and in particular INTKEY for generating taxonomic descriptions, the program I tend to use is LucID - see http://www.lucidcentral.com/
Yes, Lucid is great for generating interactive keys, and now also taxonomic descriptions. The Lucid team are very helpful and will answer your queries.
Just to inform you about survival guide about delta published by Zookeys and free accessed at http://www.pensoft.net/journals/zookeys/issue/45/ You can find the first author of the guide at RG. Cheers
I started use the DELTA in 1999. If you encounter some technical problems, please drop me a message. However, Lucid is much more friendly, which is compatible with DELTA outputs.