I'm a big Johnny Flynn fan. I think he'll be a nice PG in the NBA despite his lack of height. Hes quite athletic, has good vision and scoring ability. Won't be a world beater but I think hes just generally solid all around and I think hes probably the best pure PG in the draft (unless Rubio comes out I suppose). Granted, I really don't like this year's PG crop as a whole.
Flynn should stay a junior year to polish up his mid-range game. I'm a huge Flynn fan myself and I think he will be a good starter in the NBA.
Flynn to enter but will not hire an agent: http://www.wivb.com/dpp/sports/Flynn_ready_to_test_NBA_waters_20090401
Flynn has a lot of potential. He's a great slasher and has great court vision. He needs to work on some little things (like picking up his dribble) but he'll be good at the next level.
I thought I just heard the other day that Flynn wasn't going to bother with the draft this year and come back to 'Cuse for his junior year. Maybe I misheard that or something. That being said, I think if he goes draft this year, he's got a shot at being a lottery pick. He's got great potential, good court vision, he can get to the lane and has a solid jump shot as well.