Toddler Busy Work?

My 2.5 year old has recently started asking for “my school work” so that he can earn “my o-puter time”.  In our house, each child gets 15minutes on PBSkids.org when their seat work is completed.  So, I know that for next fall he is going to want to do school, but what can I do with someone so little that will not require constant interaction from mom?  I think that 10 minutes would be the max time that he could sit at a desk to do something, right now he does do some montessori-style work but I have to do a lot of demonstrating and he never puts it away by himself.  Maybe Kumon workbooks?  And, how do those Montessori directors get the kids to work so quietly?!  Any suggestions would be appreciated.