Legildur said:
I think Hypersmurf's example of the cleaving charging paladin is a good one for demonstrating what bonuses do not carry across to other attacks.
But he could have made it even more confusing by throwing in the Ride By Attack feat. Would the charge bonus still not apply on the Cleave?
And therein lies the true rub...
If you do house rule that true strike does not apply to the cleave attack - you open the floor for all kinds of game play questions...
What bonuses do carry over into cleave?
What about Guidance or Moment of Prescience?
If cleave is a 'second' melee attack, do I have to hit him with my weapon or handle it as a normal attack at the same bonus?
Etc.
Just an fyi

I've dealt with powergamers galore, and have found that 95% of the time, the simpler answer is the just that - the simpler answer.
Allowing True Strike to carryover may seem overpowered (at least to me it does) but it solves all the questions that could arise very quickly.
The 3E FAQ states clearly, agreeing with the 3.5 SRD, that TS only applies to a single attack - multiple attacks in a round don't get the bonus.
But are they talking about multiple attacks in a round, requiring the full attack option, or are they defining Cleave as an extra attack in the round, in which case they open the question of 'do i have to hit 'em with my weapon or can I grapple?'
I've decided to pull TS out of my game

I'm replacing it with a similar Divination spell, but it can only grant a +1 to +10 bonus, and you don't know if it'll even work. It'll last one round or until discharged.