Binary package hint: kubuntu-docs
1. When selecting »Computer« in Kickoff, I don't see a »system settings« entry anymore. (If it's still present on your system: remove and re-add it.)* An option to re-enable ctrl+alt+backspace doesn't seem to exist in lucid.
2. Strings 16 contains a dead link.
3. String 56: right-clicking on the Kickoff icon doesn't bring up the old context menu anymore, you rather have to click on the window
4. A dialog appears in Firefox if you try to open a help:/ link asking you for an appropriate application, so there's no need to manually configure that behavior anymore
5. Strings #68-#70: No system menu in kickoff
I recommend removing some strings since it's too late to adjust the translations.
David have you started working on this yet?