Here is a game I just finished:
http://dominion.isotropic.org/gamelog/201201/22/game-20120122-022711-ea54a9fa.html(cards in supply: Chancellor, Expand, Forge, Gardens, Horse Traders, Secret Chamber, Shanty Town, Smithy, Trader, and Watchtower)
I used trader to get to 5 silvers by turn 5 (reasonable) and then was lucky enough to draw 3 silvers and 2 coppers on turn 6, buying a province. At the time, I was thinking of going for a gardens strategy, and bought the province fully intending to trash the province to increase my decksize. The rate at which the trader garners silver is so fast, though, that I was able to buy provinces again on turns 9 and 10. By the time I had trashed my first province (on turn 12), it was clear I was going to be able to buy out the provinces. My opponent tried to out-compete me in gardens, perhaps an opponent who had tried a big-money strategy and gone for provinces too would have done better.
As it happens, buying provinces when I could, and trashing as much as possible with the traders (including the provinces) allowed me to buy 7 provinces by turn 19. I know my opponent was panicked, but 7 provinces by turn 19 is not too shabby. I trashed two of them on the last two turns in order to run down the silvers, since I had an insurmountable lead by then.
It helped that my opponent panicked and bought out the gardens, instead of going for a share of the provinces, but I think that using traders very aggressively to gain as much silver as possible, that is to say buying at least two traders (more probably) and always trashing the most expensive card in hand, is a worthwhile strategy in any event.