Tacos del Lago is at 822 Clark Street in downtown Evanston. I think that's Clark and Sherman, by the Papa John's.
http://www.tacosdellago.com/
I've been to this place about four times so far. I like to support independent places, so I figured the best way to do so is to spread the word.
The menu consists of basically tacos, burritos, tostadas, and tortas. Most of the dinners are around $7-8, and that comes with rice and beans. The most expensive thing on the menu is carne asada for $9.95. There are a handful of Mexican beers (Corona, Tecate, etc.) for $3-3.50. There is one desert--homemade flan for $2.50.
This place isn't going to make Check Please, but for what it is (basically a really nice taqueria), I highly recommend it. The prices are super cheap, and the service has always been good. In fact, every time I've been there, one of the co-owners was my waiter. It's not the fanciest Mexican food around, but everything does seem very fresh, and nothing is greasy.
I should have taken some photos, but I didn't think about it. I'll do so next time I go.