How do I replace the MeMenu username with my actual name?
To switch to your actual name enter the following in a console (Applications->Accessories->Terminal) or you can use the gconf-editor:
gconftool -s /system/indicator/me/display --type int 2
And to switch back:
gconftool -s /system/indicator/me/display --type int 1
It is also possible to hide the name altogether and show just the icon:
gconftool -s /system/indicator/me/display --type int 0