At one point I started the Seam 3 Spreadsheet module at

http://anonsvn.jboss.org/repos/seam/sandbox/modules/spreadsheet/

The model package was pretty OK, as the CSS parser and there is an JExcelAPI transformer available for the model. Would anyone be interested in contributing some time to

a) set up a proper Seam 3 - standards complient module structure for it
b) write JSF 2 style custom tags (facelets) tags that would use the WorkbookBuilder to create the workbook model before transformation?

I'm happy to assist in understanding the issues involved (once I read through my code so I remember it myself) ;-)

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Nik