Finally I’ve demoed new version of Idubee Flex spreadsheet application to Singapore Flex User Group (which happened to be at local Adobe office). New version of Idubee has been developed without any use of previous codebase. Cairngorm was used with some insertion of custom made Dependency Injection framework, backend was reimplemented with Spring/Hibernate/GraniteDS on Jetty instead of EJB3/GraniteDS on JBoss (mainly because of the server downgrade that I had to do).

New spreadsheet component allows virtually unlimited number of rows and columns (i’ve tested it with millions of data cells in the spreadsheet), supports multiple sheets, customizable  hot-keys,  per-character formatting, pseudo-multithreading  for formula calculations etc. The goal was to make this release reusable, performant and reliable (especially for calculations).
It’s not yet rolled out yet but if someone is interested, just drop me a line: andriyo at gmail.com