I believe it was in Quicken, but the projected daily balance stuff is not in Mint. Its been something I've wanted and just started to write for myself. If I get to a point where I feel its actually useful for me, I'll consider doing something outward facing.
I use Mint and they're pretty close. They do have bill reminders with dollar estimates (for things that fluctuate, like electric/water), so it wouldn't be much of a stretch for them to add balance projections.