Paul
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Hi Marc,
from T.H.Lee's Design of CMOS RF Integrated Circuits: "In general, the bandwidth-risetime product will range between 2 and 2.2 if the system is reasonably well-damped (or more precisely, if the impulse response is unipolar so that the step response is monotonic [...])." 2nd edition, chap 8.5.5. Notice that this expression uses the bandwidth in rad/s, not in Hz. If you divide by 2Pi, you get the 0.35 value in Jess' post. Lee also has some math and intuitive explanations on this.
Paul
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