Currently, when we gain daily reputation on one site only, the total is shown besides the label, like this:
That's nice and dandy but if I get reputation on more than one site, there's no total whatsoever.
When expanded, it will show the reputation gained on each site:
So it would be nice to see +73 in such case next to "Today", with tooltop being possibly "You earned 73 reputation today on Stack Overflow, and Meta Stack Overflow". (yes, that's an Oxford comma ;))