I'm a big fan of sweet potato fries. I've had them in three places, two of which I like a lot and one where they're just so-so.
Doyles in JP has great SPFs - thinly cut with a crispy and slightly salty outside. They're excellent.
The ones at Cambridge Commons are strangly shaped but quite yummy. They look like very thick ruffle potato chips. Cut this way, they are wonderfully crispy.
Finally, those at Johnny's Luncheonette are cut too thick for my taste, making them not too crisp and a little too potato-y. The random ones in the batch that get adequately crunchy are very good, though.
Anybody else have suggestions for places to get great sweet potato fries?