According to the Futon Critic the 10 Best Episodes of Television for 2010 are as follows:

10)  Lone Star- Pilot

aired: 9/20

9) Fringe- Peter

aired: 4/1

8) Friday Night Lights- Kingdom

aired: 12/1

7) Lost- The End

aired: 5/23

6) Breaking Bad- Full Measure

aired: 6/13

5) The Good Wife- Running

aired: 5/25

4) Community- Modern Warfare

aired: 5/6

3) Community- Contemporary American Poultry

aired: 4/22

2) Made Men- The Suitcase

aired: 9/22

1) Terriers- Change Partners

aired: 9/22

For episode descriptions and the full list of the best 50 Episodes for the year follow the link - 50 Best Episodes.