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in much the same way as KDE remembers sessions (ie which apps were open and where) after rebooting, that behaviour could be extended to include the archiving and tagging of sessions, mailing of sessions (obviously just windows & apps together and window placement), the creation of session templates and the integration of various forms of productivity management.

i've attempted to elaborate using ubuntu brainstorm here:

http://brainstorm.ubuntu.com/idea/19668/

I like it very much.

I've got something similar - as more of simpler starting point comparatively.
manageable-kde-ses ... 39056.html

Also consider a pairing with something like
http://forum.kde.org/freeze-apps-for-un ... 39395.html

I'm very much a fan of big window/desktop management ideas.