This place over on E 7th St (at Arcade) in St. Paul has received a couple of brief mentions here (thanks nieves and Paz), both positive, for pupusas and burrito respectively. I happened to be on that side of town around lunch time and stopped in.
I had a couple of pupusas (pupusae?) with the pork, refried beans and cheese. Really excellent flavor and satisfying corn dough. My frame of reference is narrow for pupusas but these were a really nice snack. Also on display were some fried plantains, which I enjoyed and sweet corn tamales. Those were a bit too dense for my liking -- the ones at Marisa's #2 in south Minneapolis are more the way I like them.
So, if you're craving pupusas, this may be your spot. I plan on working my way around the rest of their menu.
828 E 7th St
St. Paul, MN
p.s. A few other little Mexican joints along that stretch have sprouted up or tidied up their storefronts since I've been over there -- it looks like quite a lot of unexplored Chowhounding.