Great brief review Mark. Helicon Focus has been a "secret" tool of mine for years and the latest version is very good. You didn't mention that it isn't cheap. I have also found a free tool called CombineZM at http://hadleyweb.pwp.blueyonder.co.uk/CZM/News.htm which is nearly as good, especially considering that it is free! You should try it.
Here is a macro I made with Helicon Focus some time back.... http://www.pbase.com/meleader/image/72322631/original.jpg
Malcolm

