I just got an 06 Accord myself.
I had test driven one a day before this purchase... the first Honda Accord I've ever driven. It pulled to the left, weather under power or cruising, some times when I'd let go of the wheel it'd make a left turn.
The steering wheel also felt 'heavy'... I thought all Honda front wheel drive cars might be like this.
The next day I visited another dealer & drove the one I bought... it was nothing like other one, which convinced my that there was something more than an alignment issue with the first one.
I don't know anything what-so-ever about Honda... thats why I'm glad I went with a CPO car.

 

have you checked the tire pressure? then check alignment.
I know our accords are very sensitive to road and tire pressure evenness. My driver-side front tire was off by 1.5 psi and it was the cause of all my pulling problems.