Seriously, all of our videos are encoded at three speeds: 300/100/43kbps so they should work over dialup.
And, why don't you get some podcasting software like DopplerRadio or iPodder and set it to download the videos overnight to your hard drive while you sleep? That'll work even on dialup.
I don't know where he lives but over here people on dialup still have have to pay their phone bills. Back when we had dialup (well, ISDN actualy) Internet usage was limited to two hours per day to prevent the phone bill from skyrocketing.