I guess my main concern with training twice a day is that (I feel anyways) it's something that should be built up to, not started on (yes, poor grammar, I know). I used to train twice a day, heck sometimes 3 times a day (row in the morning, erg at lunch, row in the evening), but that was after 4 months of once-a-days. I don't think my body would have been able to tolerate twice a day right away (I mean, yes you can do a recovery workout, but you could _also_ do nothing and recover too =P). I guess it's also different for repetitive motion sports--novices who train twice a day are at higher risk of injury.
I guess to each his/her own. Athletes train twice a day because that's what appears to be what it takes to win. I think for most lifting-to-be-in-better-health-and-look-better people, it's not necessary. Pick up a hobby =).
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